Webmaster tools.

Internal link analysis and a check of outgoing links on your site's pages.

A bracketed template expands into a set of phrases without repeats.

A site map by crawling pages or from a ready list of addresses.

Ready-made link code: a regular link, an email, phone or anchor.

How your link looks when shared to social networks and messengers

Title, description and robots: what's in the code and what survives in results

Robots.txt errors and a check of whether a URL is blocked

A robots.txt for your CMS, with checks and a comment on every line

Tracking labels with platform macros, the erid token and link breakdown

Addresses from headings: four transliteration schemes and duplicate search

Markup in all three flavors, with fields checked by type

Checks A/B test significance from visitors and conversions, shows the lift with a confidence in…

Calculates ROI and annual return on your investment.

Calculates the return on marketing investment, factoring in the cost of goods sold.

Calculates how long it takes for an investment to pay for itself.

Calculates CPM, the budget for a target number of impressions, and impressions for a given budg…

Calculates the CTR of an ad and compares the CTR of two ads.

Counts person-days and person-hours, the duration and finish date of a job from the production …

Builds an llms.txt file from a sitemap or your own list of pages and checks the finished file.

Status code, response headers and the full redirect chain — for one address or a whole list.

Layer-by-layer checks from several locations: the site down, or just you?

The redirect chain step by step, including meta refresh, and how a site's mirrors are glued tog…

Load time broken into phases: DNS, connection, server response and page weight.

A page's raw HTML as the Yandex or Google robot sees it.

How a page looks at different screen widths.

Markup errors against the standard, with human-readable explanations

A site's engine and the clues that identified it

A verdict on responsiveness, with proof from the code and styles

Response headers explained, with security scoring and cache checks

Site cookies with flags, lifetimes and code counters explained

TTFB as the median of five runs, broken into parts

Takes a screenshot of the whole page by URL, as it looks on a computer or a phone.

Shows where a short link leads, with the full redirect chain and a check of the final domain.

Calculates monthly and daily site traffic, average and peak bandwidth in Mbit/s, and, in revers…

Checks a page with a regular and a conditional request, shows whether a 304 Not Modified comes …

Verifies an address without sending an email, with catch-all detection.

Is a port open from the internet? Three states and which service answers.

Expiration date, chain of trust, TLS versions and the redirect to https.

Is a domain free? Who is the registrar, key dates and DNS servers — straight from the registrie…

Converts an address to punycode and back, direction detected automatically.

All domain records explained, with every name server queried directly

All domain addresses with network, country and liveness checks

An address through the registries, an abuse contact and spam list checks

The site's host, its network and an abuse contact

PEM, DER, PKCS#8, P7B and PFX. The format is detected on its own.

Find the company and country behind a MAC address, or check a whole list from your router.

An IPv6 converter: compresses an address per RFC 5952 and expands it back to full form, with th…

Shows the registration date of a domain and its exact age.

Calculates the network address, mask, and address range, splits a network by device count, and …

Shows who an IP address is assigned to: the network, owner, country, and the abuse contact from…

Examines a domain's mail servers: addresses, MX record errors, reverse names, spam lists, and t…

Examines a domain's TXT records: SPF with every include, DMARC, DKIM, service verification code…

Breaks a DMARC record down as RFC 7489 defines it: policy, subdomains, report addresses, the SP…

Expands every include, counts DNS lookups and void queries, spots errors and builds the list of…

Builds an SPF record from mail providers, your own addresses and domain servers, validates the …

DKIM key by selector or brute force: key length, revocation, record errors

Checks whether an IP address or domain is on the Spamhaus, Barracuda and other spam blacklists.

Converts an IPv4 address to binary, octet by octet and as one string, plus hexadecimal. You can…

Unwinds the CNAME chain down to the final address, spots dangling aliases and forbidden records…

Four pings from our server: latency, packet loss and TTL. If a host ignores ping, ports 443 and…

Blacklists for the address and who is behind it: a Tor exit node, a data center, a content deli…

Finds the autonomous system number for an IP address or domain; by AS number it shows the owner…

Creates an SSL certificate signing request and a private key right in your browser: multiple do…

Finds the subdomains of a site.

Builds a DKIM key pair and a ready TXT record that you only need to add to your domain's DNS.

Takes the reverse records of a domain or IP address and checks them both ways: the name from th…

Shows the route packets take to a domain or IP address, with every hop and its response time.

487 characters in twelve sections, with click-to-copy.

Type as in a text editor and get ready-made HTML.

Color codes in HEX, RGB, HSL and HSB, with a contrast check

Frosted glass with a text readability check and a fallback

Flat CSS becomes SCSS with nesting, and back, verified against your source.

A grid for three screens, with ready HTML and a block-order check

Gradients without a gray middle, with a text readability check

Layered shadows, previewed on two backgrounds with a visibility check

A color in ten notations, with sRGB and P3 coverage checks

Contrast by WCAG and APCA, with a passing color suggested

Minify and format code, with the result checked against the source

Cleans code after Word and Google Docs, counts what it removed

Shows the color for an RGB code: channel sliders, any rgb() or HEX notation, and contrast again…

Builds CSS animations: presets, a keyframe and easing editor, a preview you can scrub through, …

RGB to HEX and CMYK and back, as a whole string or per channel

Builds a palette from a base color in six harmonies, shows HEX, RGB, and HSL codes, and exports…

Checks whether two colors work together: a color wheel scheme, ΔE2000 perceptibility, WCAG cont…

Generates a random color with its HEX, RGB and HSL codes; you can limit it to pastel, bright, d…

Mixes colors like paints on a palette: yellow and blue make green. Also figures out which paint…

Format and repair JSON in the browser, flagging duplicate keys and long numbers

Regex testing with a plain-language breakdown and hang protection

JWT parsing with fields explained and signature verification

A table to JSON with honest types and a reverse check

JSON to a table for Excel, with verification and formula protection

A readable query layout, verified against the source, with risky spots flagged

Readable XML, errors explained with a hint, verified against the source

Markup, XSD schema, sitemap, YML and RSS rules, with the path to each error

Nine modes in both directions, catches double escaping

All errors with path and line, field name typos, a schema from a document

A schedule in plain words, runs in the server timezone, cron traps explained

Selection by RFC 9535 with path and line for every match

Base64 encode and decode with UTF-8 support

URL encoding in four forms, punycode and links split into parts

Timestamp to date and back, timezones and period boundaries

Hashes of text and files, checksum verification, HMAC

UUID v4, v7, v1, v5 and v3, plus analysis of a value from elsewhere

Time in several cities, a day strip and a summary line for chats

Find out which algorithm produced a hash and how to feed it to hashcat and John the Ripper. Sho…

Checks card numbers, IMEIs, and other numbers with the Luhn algorithm, computes the check digit…

Calculates the CRC32 of text, hex bytes, and files of any size right in the browser, with a cho…

Converts text to ASCII and Unicode codes and back, in decimal, hexadecimal, binary, and octal.

MD5 of text and files of any size in the browser, with a choice of encoding

HEX to binary, decimal, and text and back, numbers of any length

Converts Markdown markup into clean HTML code with a live preview.

Converts HTML code into Markdown for GitHub, Obsidian and documentation.

Turns a vless:// link into an Xray or sing-box JSON config, and back.

Converts JSON into an Excel (.xlsx) table, spreading nested objects across columns and lists of…

Converts an Excel (.xlsx) worksheet into an array of JSON objects, keeping numbers, dates and b…

Builds a PDF document from JSON, as a table or as formatted code, with Russian text support.

Extracts text from a PDF page by page and writes it out as JSON. The file is read right in your…

Converts text to JSON: a list of lines into an array, name=value lines into an object. The reve…

Converts XML to JSON: attributes become fields with "@", repeated tags become arrays, element t…

Converts JSON to XML: fields with "@" become attributes, arrays become repeated tags, and field…

Linux permissions in numbers and letters: 644, rwxr-xr-x, setuid, sticky

Converts an integer from any number base from 2 to 36 into any other, with no loss of digits.

Decodes a Roman numeral and shows what it adds up to. MCMXCIV is 1000 + 900 + 90 + 4.

Writes an ordinary number in Roman digits. 2026 becomes MMXXVI, with a part-by-part breakdown.

Converts a date to Roman numerals and back: 19.09.2026 becomes XIX.IX.MMXXVI. Parses existing n…

Converts YAML to JSON: anchors and references are expanded, long numbers and 1.10 keep their ex…

Converts JSON to YAML: field order and long numbers are preserved, strings like "no" and "0755"…

Converts bytes to kilobytes, megabytes and gigabytes at once using both 1000 and 1024, and show…

Converts kilobytes to megabytes, bytes and gigabytes using 1000 and 1024, with small fractions …

Converts megabytes to gigabytes, kilobytes and bytes using 1000 and 1024, and shows how much sp…

Converts gigabytes to megabytes, terabytes and bytes using 1000 and 1024, and shows how much sp…

Builds a .gitignore from templates for languages, frameworks and editors, and checks the finish…

Validates an IBAN against the registry: country, length, format of each part, check digits and …

Turns a CSV table into HTML table code: header row, numbers right-aligned, styling in a <sty…

Pulls a table out of HTML code or a live page into CSV for Excel; merged cells are expanded, an…

Type on the left, get Markdown on the right

Converts Cyrillic text to translit, right in the browser.

Characters, words and paragraphs, platform limits and reading time.

Typos and repeated words with replacement options, in Russian and English.

A text file from what you typed, with a choice of encoding

Differences between two text versions, including the invisible edits

Markup on the left, result on the right, notes as a separate list

Every case at once: plain-text cases plus camelCase, snake_case, kebab-case

Reading time silent and aloud, with pauses, plus a label for the article

Caesar, Vigenère and Atbash with a Russian alphabet and shift detection

Finds the key to Caesar, Vigenère and Atbash ciphertext

Turn text into unusual lettering with Unicode characters: for nicknames, profile names and bios.

Fix text typed in the wrong layout: "ghbdtn" becomes "привет".

Translate text to Morse code and back, play it as sound, and decode a recording.

Replace words in text online: case handling, several replacements at once, and a check for each…

Sort a list by line length: shortest or longest first, with each line's length and overall stat…

Upside-down text for nicknames and messages: Cyrillic letters with capitals, mirrored, backward…

Text as in a mirror: with characters for nicknames and messages, or as a PNG image for printing…

Counts how many edits turn one string into another: the edit list, a similarity percentage, and…

Pulls phone numbers out of text and files with no duplicates, keeps extensions, and exports to …

Counts sentences with abbreviations, initials, and decimal numbers handled: a sentence list, ea…

Counts punctuation marks in text by type: commas, periods, dashes, five kinds of quotes and bra…

Estimates how many pages your text will fill given the font, font size, line spacing, and margi…

Shuffles words, letters, lines, sentences, or paragraphs.

Removes all letters from text, or only Cyrillic, only Latin, or your own list of letters, with …

Removes single digits or whole numbers from text along with their inner separators: fractions, …

Removes punctuation from text without gluing words together: hyphens inside words, apostrophes,…

Removes double and non-breaking spaces, tabs, spaces at line edges, extra blank lines, and invi…

Generates filler text for mockups: Russian with real words or classic Latin Lorem ipsum, with h…

A sum in English words for invoices, receipts and contracts, ready to copy

Swaps Russian and English letters for look-alike hieroglyphs, with three character sets and one…

Removes tabs from text and code: snapping to tab stops, replacing with spaces or a custom separ…

Removes spaces before a comma, period, ellipsis, closing quote or bracket and adds a space afte…

Merges text into one flow: line breaks are replaced with a space, a comma or a character of you…

Turns a word or short phrase into big letters built from characters: hash marks, blocks, Braill…

A full set of site icons from an image, letter or emoji.

Glues icons into one file with ready-made CSS.

A caption or watermark on photos, with batch processing.

A semi-transparent caption or tile across the whole image.

An image editor in the browser, nothing to install

A palette from a picture, with color shares and a contrast check

Image size by width, height or percent, saved as JPEG, PNG or WebP

Frame by mouse or exact pixels, everything happens locally

QR reading from an image or camera, contents split into fields

Copies of a photo with varied edits and a hash drift measurement

A photo's metadata in full, parsed right in your browser

Edits a photo's date, author and coordinates without touching the image

Turns iPhone photos into JPG right in your browser: files stay on your device, and several at a…

Reads a barcode from a photo or your camera right in the browser: number, format, check digit, …

Calculates screen pixel density from resolution and diagonal, and print size from DPI, with pre…

Shows an image's aspect ratio from a file or from width and height, and calculates the crop and…

Calculates height from width and a chosen ratio, the aspect ratio from dimensions, scaling, and…

Compresses a Lottie animation into the .tgs format that the @Stickers bot accepts, and unpacks …

Puts an image into JSON, as base64, a dot matrix or file details.

Rebuilds an image from JSON, from base64, a dot matrix or a snapshot of the code itself.

Shows a photo's size in pixels, the pixel count, megapixels, aspect ratio, file size and print …

Turns a list into a PNG or JPG image: bullets, numbering, wrapping of long items and fonts with…

Turns any text into a PNG or JPG image: fonts with Cyrillic support, a solid, gradient or photo…

Turns a photo into a negative, swapping every color for its opposite, with a before-and-after c…

Adds noise or film grain to a photo: four noise types, plus grain strength, size and softness.

Changes brightness, contrast and saturation of a photo, brightening or darkening it without blo…

Strengthens or softens a photo's contrast, with auto contrast picked for each image and a befor…

Makes photo colors richer or calmer: saturation and vibrance with skin-tone protection and an a…

Turns a photo into shades of gray, with brightness, contrast and sepia toning.

Blurs a whole photo, only the areas you outline, or everything except them.

Makes a photo look pixelated: big squares, a palette from the photo or a ready-made one (Game B…

Blurs a photo's edges, fades them out into a white or transparent background, darkens them with…

Makes a photo sharper: boosts edges and fine details, with automatic strength or a slider of yo…

Changes a photo's exposure in EV stops, like in a camera, with separate control over shadows an…

Straightens a tilted shot: draw a line along the horizon or a wall edge, and the photo rotates …

Gives a photo sepia tones like an antique print: tone strength, a share of the original color, …

Adds a vignette to a photo: dark, light or colored edges, with size, softness and shape, plus h…

Adds a glow to a photo: soft radiance in the bright areas, the Orton effect, a neon outline aro…

Turns a photo into a bas-relief lit from the side: gray emboss, gold, silver, copper or the sho…

Rotates a photo 90° left or right, by 180°, or to any angle without cropping.

Rounds the corners of a photo: corner radius, which corners to round, a regular or smooth iPhon…

Layers one photo on top of another: move and stretch the overlay, rotate it, change its opacity…

Ready-made photo filters: warm, cold, vintage, film, noir, sepia and more, with previews on you…

Captures your screen with one button right in the browser: select the area you need, add an arr…

Cuts an image into equal parts on a grid: pieces for a social-media carousel or profile grid, o…

Splits a photo into red, green and blue channels plus alpha: each in gray or in color, all chan…

Creates a gradient image in any size: linear, radial, conic, or soft blends of colored blobs. R…

Turns a photo into a character drawing: ASCII art, Braille dots, or an outline drawn with lines.

Company names by industry or from your own word.

Random English names with a middle name, age and date of birth.

Builds usernames from meaningful words on a topic, not random letter strings.

Links, Wi-Fi, contact cards and more, saved as PNG, SVG or PDF

EAN-13, EAN-8, UPC-A, Code 128, Code 39 and ITF-14 as PNG or SVG

Test files of an exact size: PNG, PDF, DOCX, XLSX, ZIP, CSV and more.

Corrupt a file to test an uploader: one kind of damage per file, with a description of the cons…

Builds a batch of unique promo codes by length or pattern: no look-alike characters or awkward …

Random words with settings: part of speech, length, first letter, topic.

Random numbers in a range with no repeats, dice and a coin flip.

Generates random IPv4 and IPv6 addresses: public ones without reserved blocks, private ones, or…

Generates random MAC addresses: locally administered ones or with a vendor prefix from the IEEE…

Generates email addresses for testing on example.com or your own domain, random ones or based o…

Generates random strings from letters, digits, special characters, and your own symbols, with n…

Generates random dates and times in a range: weekdays and hours, time zones with daylight savin…

Picks a random item from your list: a word, a name or an option.

Generates random jobs with their field and a short description.

Generates random numbers following a normal distribution with your chosen mean and standard dev…

Makes up words that don't exist in any dictionary: Russian nouns, adjectives and verbs, simple …

Build a ZIP from files and folders, with a password.

Shrink a PDF: three compression levels, with text and fonts left untouched.

Rebuild a broken PDF: the cross-reference table, catalog and pages are restored from the object…

Builds an ISO image from your files and folders right in your browser. Burn it to disc, mount i…

Open an ISO image and pull out files: browse, search, ZIP, boot records.

Remove, replace or add files inside an existing ISO image and rebuild it.

Turn a BIN disc image with its CUE sheet into a plain ISO.

Turn an Alcohol 120% disc image into a plain ISO.

Build an ISO image from a ZIP archive: unpacking and assembly happen in the browser, and every …

Open a DBF table, view the records and fix values in the cells.

Converts a color PDF to shades of gray or to pure black and white.

Converts a TXT text file to PDF: Cyrillic letters in any encoding, line wrapping, font size, ma…

Extracts text from a PDF into a TXT file: page by page, with your choice of separator and encod…

Combines several PDF files into one: drag to reorder the files, pick the pages you need from ea…

Removes extra pages from a PDF by number, or keeps only the ones you need. The pages, text and …

Converts typed text or a text file into an ODT file: every line becomes a paragraph, and every …

Turns an ODT file into plain text: paragraphs, headings, list items, and table cells all become…

Removes EXIF, GPS coordinates and C2PA tags from a photo

Random, pronounceable or digits-only, with strength in bits

Shows how long a password takes to crack and which parts are weak

Cleans a PDF of the author, dates and traces of earlier edits

Cleans docx and doc: author, edits, rsid, EXIF of photos inside

Cleans MP4, MOV and MKV of coordinates, dates and camera tags

What a site sees about you: proxy tells and browser fingerprint

We take a domain apart and check it against blocklists.

We find the seller's business details, check the offer and look at how the store asks for payme…

Hide text or a file inside an image and get it back out. With a password, the content is encryp…

A password made of random words: easier to remember than a string of characters, and slower to …

See which addresses your browser exposes through WebRTC, and compare the external one with what…

Creates an Ed25519, RSA or ECDSA SSH key pair right in your browser, with the private key outpu…

Hashes a password into bcrypt, Argon2id, SHA-512-crypt or Django PBKDF2 and verifies a password…

Creates "name:hash" lines for password-protecting a site, and the whole .htpasswd file with all…

Your IP, provider and country, browser headers and proxy signs.

Version, engine, technology support and browser settings.

Download speed, upload speed and ping, on a computer or a phone.

How long a file takes at your speed

A step-by-step test: channels, balance, phase, frequency range and rattle, with your answers re…

A blind test of sides: six trials mixed up, with the highlighting turned off during each one.

Keep your screen from going dark: one button, a timer, and a full-screen clock.

Shows your real screen resolution and CSS pixel size, the browser window, zoom, and a compariso…

Calculates a screen's width, height, and area from diagonal and aspect ratio, plus the diagonal…

Checks whether cookies are being saved in your browser.

Stopwatch with lap times and a signal at equal intervals. The screen stays awake while the time…

20 seconds of work and 10 seconds of rest, 8 rounds.

Shows your phone's external IP address and your carrier's. The Wi-Fi address and connection typ…

Fills your screen with nine solid colors and two gradients to reveal a dead or stuck pixel or a…