OmniTools

Free Online JSON Formatter and Validator

Format, validate, and beautify JSON instantly in your browser with local processing by default.

Free Online JSON Validator

Validate JSON syntax instantly with detailed error diagnostics and local browser processing.

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Free Online Word and Character Counter

Count words, characters, sentences, paragraphs, and estimate reading time instantly.

Free Base64 Encoder and Decoder

Encode and decode text to and from Base64 instantly in your browser.

Free Percentage Calculator

Calculate percentages, increases, decreases, and ratios instantly.

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Free QR Code Generator

Generate custom QR codes for URLs, text, and WiFi instantly in your browser.

Online Stopwatch and Timer

Precise online stopwatch with lap times and countdown timer.

URL Encoder and Decoder

Encode and decode URLs and query parameters instantly.

Free UUID v4 Generator

Generate random UUIDs (v4) instantly with bulk copy support.

Online Hash Generator (SHA-256, SHA-512)

Generate cryptographic hashes (SHA-256, SHA-512) instantly in your browser.

Merge PDF Files Online Free

Combine multiple PDF files into one document in your browser. Reorder files before merging. No uploads, no watermarks.

Split PDF Online Free

Split a PDF into separate files, one per page or by custom page ranges like 1-3, 5, 7-9. Download individually or as a ZIP.

Extract PDF Pages Online Free

Select specific pages from a PDF and save them as a new document. Supports page numbers and ranges, entirely in your browser.

Delete PDF Pages Online Free

Remove unwanted pages from a PDF and download the trimmed document. Runs locally in your browser with no uploads.

Rotate PDF Online Free

Rotate PDF pages 90° clockwise, 180°, or 90° counter-clockwise. Rotate selected pages or the whole document in your browser.

PDF to JPG Online Free

Convert PDF pages into JPG images in your browser. Choose pages and quality, then download individually or as a ZIP.

PDF to PNG Online Free

Convert PDF pages into lossless PNG images in your browser. Select pages and scale, then download as PNG or ZIP.

JPG to PDF Online Free

Turn JPG photos into a single PDF document. Reorder images and choose page sizing, all in your browser.

PNG to PDF Online Free

Convert PNG images into a single PDF document with transparency flattened, entirely in your browser.

Online Stopwatch with Laps

A precise online stopwatch with lap times. Keeps accurate time even in a background tab. Runs entirely in your browser with nothing to install.

Online Countdown Timer

Set a countdown timer in your browser with presets for 1, 5, 10 and 25 minutes. Stays accurate in background tabs and alerts you when time is up.

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Random Wheel Spinner

Add your own entries and spin a random wheel to pick a winner. Uses cryptographically secure randomness, and the result is announced as text as well as visually.

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Random Picker

Paste a list, one item per line, and pick a random entry. Uses secure randomness, works instantly, and never sends your list anywhere.

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Coin Flip

Flip a virtual coin once or hundreds of times. Secure randomness, instant heads/tails result, and a full summary with counts and percentages.

Typing Speed Test

Measure your typing speed in words per minute with live WPM, CPM and accuracy. Choose 15, 30, 60 or 120 seconds. Nothing you type is ever transmitted.

Percent Off Calculator

Enter a price and a discount percentage to see the amount saved and the final price. Handles decimals exactly, so the numbers always add up.

Percentage Increase Calculator

Compare two values to get the absolute change and the percentage increase or decrease. Explains the formula and handles zero and negative values honestly.

Unit Converter

Convert between length, area, volume, mass, temperature, time, speed and digital storage units. Searchable units, exact factors, and no server round trip.

What Is My IP Address?

See the public IP address your browser is connecting from. Nothing is stored, nothing is logged, and your IP is never sent to analytics.

IPv4 Address Validator

Validate an IPv4 address with precise error reasons: wrong segment count, out-of-range octets, or ambiguous leading zeros. Runs entirely in your browser.

CIDR Calculator

Enter a CIDR block such as 192.168.1.0/24 to get the network and broadcast addresses, masks, usable host range and host count — including correct /31 and /32 behaviour.

Subnet Calculator

Calculate subnet details from an IP address plus a mask or prefix. Shows network, broadcast, mask, wildcard, host range and host count, all client-side.

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YouTube Thumbnail Downloader

Paste a YouTube link to preview and download its thumbnails in every available size. The video ID is parsed locally and images come straight from YouTube.

Reorder PDF Pages Online Free

Move PDF pages into any order with simple up and down controls, then download the rearranged file. Runs entirely in your browser.

Reverse PDF Page Order Online Free

Flip a PDF so the last page comes first, in one click. Every page is preserved and the file never leaves your browser.

Duplicate PDF Pages Online Free

Repeat chosen PDF pages any number of times, either in place or appended at the end. Deterministic order, entirely in your browser.

Add Text to PDF Online Free

Place text on any PDF page with control over position, font, size, colour, opacity and rotation. No signup, no upload, no watermark.

Add Image to PDF Online Free

Place a PNG or JPEG onto chosen PDF pages with position, size and opacity control. The aspect ratio is always preserved and nothing is uploaded.

Add a Watermark to PDF Online Free

Stamp text such as DRAFT or CONFIDENTIAL across a PDF, once per page or tiled, with control over opacity, rotation and size. Fully client-side.

Add Page Numbers to PDF Online Free

Number PDF pages with a custom start value, prefix, suffix and position. Optionally show "3 of 12" totals. Runs entirely in your browser.

Image Compressor

Compress images in your browser with a quality slider and a before/after size comparison. Honest reporting: if a re-encode makes the file bigger, it says so.

Image Resizer

Resize images by pixel dimensions or percentage, with an optional aspect-ratio lock. Choose the output format and download instantly, all client-side.

Image Cropper

Crop an image freeform or to a fixed ratio such as 1:1, 4:3 or 16:9. Live preview, exact pixel output, and nothing ever uploaded.

JPG to PNG Converter

Convert JPG images to lossless PNG in your browser. Dimensions are preserved exactly and no external service is involved.

PNG to JPG Converter

Convert PNG to JPG with a quality slider and a chosen background colour for transparent areas. Runs entirely in your browser.

WebP Converter

Convert WebP to JPG or PNG, or convert JPG and PNG to WebP for smaller files. Uses your browser encoder, with a capability check before claiming support.

PDF to Text

Extract all text from a PDF in your browser and download it as a .txt file. Page boundaries are preserved and nothing is uploaded.

Search Inside a PDF

Search for words or phrases inside a PDF and jump between matches with page numbers. Runs locally in your browser.

PDF Metadata Viewer & Editor

View and edit PDF title, author, subject, keywords, creator, producer and dates, then download the updated file. Fully local.

Remove PDF Metadata

Clear the author, title, subject, keywords, creator and producer from a PDF, then download the cleaned file. Verified by re-reading the output.

Fill a PDF Form Online Free

Detect the fields in a fillable PDF, enter your values, and download the completed form. Text, checkbox, radio and dropdown fields supported.

Flatten PDF

Convert a filled PDF form into fixed page content so the values can no longer be edited. The output is re-checked to prove flattening worked.

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ISO 8601 Date Converter

Convert between ISO 8601 timestamps and readable dates, showing UTC, your local time and the exact offset side by side.

Unix Epoch & Timestamp Converter

Convert Unix timestamps in seconds or milliseconds to readable dates and back, with UTC and local views. Handles negative and large values.

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Business Days Calculator

Count business days and calendar days between two dates, with a configurable workweek and your own holiday list. Inclusive behaviour is explicit.

Age Calculator

Calculate an exact age in years, months and days from a date of birth, with total days, weeks and the next birthday. Leap years handled correctly.

Cron Expression Generator & Explainer

Build a valid cron expression field by field, read it back in plain English, and see the next scheduled run times before you deploy it.

Passphrase Generator

Generate memorable passphrases from a local word list using your browser’s secure random source, with the exact entropy shown.

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Random String Generator

Generate cryptographically secure random strings with your choice of length and character sets, optionally excluding look-alike characters.

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HMAC Generator

Compute an HMAC signature from a secret key and message using the Web Crypto API. Hex and Base64 output, entirely in your browser.

File Hash Calculator

Calculate the SHA-256, SHA-384 or SHA-512 checksum of a file locally, with real progress on large files and a compare box for verification.

Password Strength Checker

Estimate how resistant a password is to guessing, with specific findings on dictionary words, patterns, sequences and repeats. Nothing is stored or sent.

JWT Decoder

Decode a JWT header and payload, inspect its claims, and see expiry warnings. Decoding is not verification, and this tool says so plainly.

Number Base Converter

Convert integers between binary, octal, decimal, hexadecimal and any base from 2 to 36, exactly, with two’s-complement views.

Sentence Counter

Count sentences, words and paragraphs in any text, with abbreviations and decimals handled and every ambiguous boundary reported.

Line Counter

Count total, non-empty, blank and whitespace-only lines, detect the line-ending style, and see the longest and average line length.

Reading Time Calculator

Estimate how long text takes to read at a configurable words-per-minute, with a separate speaking time for scripts and presentations.

Remove Duplicate Lines

Remove duplicate lines while preserving order, with case-sensitive and whitespace-aware comparison and a report of what was removed.

Sort Lines

Sort lines alphabetically, numerically, by length or in natural order, ascending or descending, with deterministic and reproducible results.

JSON Minifier

Minify JSON by removing insignificant whitespace, with exact size savings reported and string contents preserved byte for byte.

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Text Diff

Compare two texts line by line and see exactly what was added and removed, with a minimal edit script and a copyable unified diff.

XML Formatter and Validator

Format and validate XML with real indentation, precise error locations, and CDATA and comments preserved exactly.

CSV Formatter and Viewer

Parse and reformat CSV correctly, including quoted fields, escaped quotes, embedded commas and newlines inside values.

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Markdown Preview

Write Markdown and see rendered HTML live, with GitHub-flavoured tables and task lists, and the output sanitised against XSS.

Regex Tester

Test JavaScript regular expressions against sample text with live matches, capture groups, named groups and clear syntax errors.

URL Parser

Split any URL into scheme, host, port, path, query parameters and fragment, with security warnings and credentials never displayed.

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Ratio Calculator

Simplify ratios to their lowest terms, solve proportions for a missing value, and scale a ratio to a known quantity using exact arithmetic.

Average Calculator

Calculate the mean, median, mode, range and standard deviation of a list of numbers, with an exact sum and invalid entries reported.

Fraction Calculator

Exact fraction arithmetic with automatic simplification, mixed numbers, and recurring decimals shown exactly rather than rounded.

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GCD and LCM Calculator

Find the greatest common divisor and least common multiple of two or more integers, with prime factorisations and the Euclidean steps.

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Prime Number Checker

Check whether a number is prime, see its smallest factor and full factorisation, and find the next and previous primes.

Image to Base64 Converter

Convert an image to Base64 and a data URL, with ready-made CSS and HTML snippets and the size overhead reported honestly.

Base64 to Image Converter

Decode a Base64 string or data URL back to an image, preview it, and download the file, with the real format verified from its bytes.

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Image Dimensions Checker

Read an image’s width, height, aspect ratio, format and file size straight from its header, without decoding the pixels.

Image Colour Picker

Click any point on an image to read its exact colour as HEX, RGB and HSL, with contrast ratios and a correctly mapped source pixel.

Favicon Generator

Generate a complete favicon set from one image: favicon.ico, the PNG sizes browsers request, an Apple touch icon, a maskable icon and the manifest.

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Word Unscrambler

Enter your letters and find every word that can be spelled from them, longest first, with duplicate letters handled correctly.

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Anagram Solver

Find every word that uses exactly the same letters as your input, using a precomputed signature index for instant results.

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Word Finder

Find words that start with, end with or contain given letters, match a wildcard pattern, or fit a length — filters combine freely.

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Random Letter Generator

Generate random letters with control over case, vowels or consonants only, exclusions, repeats, and an optional English letter distribution.

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Random Word Generator

Generate random English words with optional length and prefix filters, drawn securely from a local dictionary with no network request.

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Words by Length

List every English word of a given length, with optional starting, ending and contains filters — useful for crosswords and word games.

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UTM Builder

Build tagged campaign URLs with correct encoding, existing query parameters preserved, and the common UTM mistakes flagged.

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Meta Tag Generator

Generate title, description, Open Graph and Twitter card tags from one set of inputs, correctly escaped and length-checked.

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robots.txt Generator

Build a robots.txt with user-agent groups, allow and disallow rules, sitemaps and presets, plus warnings for the rules that surprise people.

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Canonical URL Generator

Normalise a URL and generate its rel=canonical tag, with tracking parameters stripped and every change listed explicitly.

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Open Graph Preview

Preview how your title, description and image will appear on Facebook, X, LinkedIn and in search results, rendered locally from your own values.

Time Zone Converter

Convert a time between any two time zones with correct daylight saving, real UTC offsets, and the date shift shown explicitly.

Time Calculator

Add or subtract durations from a time, find the gap between two times, and sum several durations — with midnight crossings shown clearly.