⚙️ WasmTools

Free online tools that never upload your files

Free browser tools powered by WebAssembly — everything runs locally, nothing is uploaded.

Every tool runs locally via WebAssembly or your browser's own APIs — free, no signup, no watermark. Close the tab and nothing remains.

Data

Format, validate, and transform structured text — all locally.

Age Calculator

Calculate exact age in years, months, and days, plus total days/weeks/hours lived and a next-birthday countdown.

runs locally

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text, instantly in your browser.

WebAssemblyCLI / agent

Case Converter

Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and kebab-case.

WebAssemblyCLI / agent

Color Converter

Convert colors between HEX, RGB, and HSL formats instantly.

WebAssemblyCLI / agent

Color Palette Extractor

Extract the dominant colors from any image as a hex palette with percentage shares.

runs locally

Cron Parser / Schedule Explainer

Translate any 5-field cron expression into plain English and see the next 10 run times — computed locally in your timezone.

runs locally

CSS Formatter

Beautify (pretty-print) minified or messy CSS instantly, right in your browser.

runs locally

CSS Generator (Gradient & Shadow)

Build CSS gradients and box shadows visually with live preview and copy-ready code.

runs locally

CSV to JSON Converter

Convert CSV data to a JSON array of objects, using the header row as keys.

WebAssemblyCLI / agent

Diff Checker

Compare two texts line by line with a color-coded diff: removed lines in red, added lines in green, plus a copyable unified diff.

runs locally

Text Encryptor / Decryptor

Encrypt or decrypt any text with a passphrase using AES-256-GCM — keys never leave your browser.

runs locally

Hash Generator

Calculate MD5, SHA-1, SHA-256, SHA-512, and CRC32 checksums of any text.

WebAssemblyCLI / agent

HTML Formatter

Beautify (pretty-print) minified or messy HTML instantly, right in your browser.

runs locally

HTML to Markdown Converter

Convert HTML pages and snippets to clean GitHub-Flavored Markdown instantly.

runs locally

Image to Base64 Converter

Convert any image to a Base64 string or data URI for embedding in HTML, CSS, or JSON.

runs locally

JavaScript Formatter

Beautify (pretty-print) or minify JavaScript code instantly, right in your browser.

runs locally

JSON Formatter

Format, validate, minify, and escape JSON instantly. Powered by Rust + WebAssembly.

WebAssemblyCLI / agent

JSON to CSV Converter

Convert a JSON array of objects to CSV with proper quoting — columns come from the union of all keys, nested values are stringified.

runs locally

JWT Decoder

Decode a JSON Web Token and inspect its header, payload, and signature — without sending it anywhere.

WebAssemblyCLI / agent

Lorem Ipsum Generator

Generate placeholder lorem ipsum text by paragraphs, sentences, or words.

WebAssemblyCLI / agent

Markdown to HTML

Convert Markdown to clean HTML instantly, right in your browser.

WebAssemblyCLI / agent

Open Graph / Meta Tag Generator

Generate Open Graph, Twitter Card, and SEO meta tags for any page, with a live link-preview card — no signup.

runs locally

Password Generator

Generate strong random passwords with letters, digits, and symbols.

WebAssemblyCLI / agent

Pomodoro Timer

A classic Pomodoro timer: 25-minute work sessions, short breaks, and a long break every fourth session — with a beep and tab-title countdown.

runs locally

Random Name Picker

Pick one or more random names from your list with a suspenseful spin animation — great for giveaways, raffles, and choosing who goes first.

runs locally

Regex Tester

Test regular expressions against text and see every match with its position.

WebAssemblyCLI / agent

Robots.txt Generator

Create a valid robots.txt file with allow/block rules, sitemap and crawl-delay — with a live preview and one-click download.

runs locally

Line Sorter / Deduplicator

Sort lines alphabetically (A→Z or Z→A), remove duplicate lines, or reverse their order.

WebAssemblyCLI / agent

SQL Formatter

Beautify (pretty-print) SQL queries for MySQL, PostgreSQL, SQLite and more, right in your browser.

runs locally

SQLite Viewer

Open a SQLite database file in your browser and run SQL against it — the file never leaves your device.

runs locally

Text Splitter / Joiner

Split text into lines by a delimiter, or join lines back together with a separator.

WebAssemblyCLI / agent

Unix Timestamp Converter

Convert Unix epoch timestamps to human-readable dates and back.

WebAssemblyCLI / agent

Typing Speed Test

Measure your typing speed in words per minute (WPM) with live accuracy stats — no account, no tracking.

runs locally

Unit Converter

Convert between metric and imperial units live in both directions — length, weight, temperature, volume, area, speed, data, and time.

runs locally

URL Encoder / Decoder

Percent-encode text for safe use in URLs, or decode it back.

WebAssemblyCLI / agent

UUID Generator

Generate random UUID v4 identifiers — one at a time or in bulk.

WebAssemblyCLI / agent

Wasm File Explorer

Inspect a .wasm binary: sections, imports, exports, function signatures, and hex — right in your browser.

runs locally

WAT ⇄ WASM Converter

Compile WebAssembly Text Format (WAT) to .wasm, decompile .wasm back to WAT, and format or minify WAT — all locally.

runs locally

Word Counter

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

WebAssemblyCLI / agent

ZIP Compressor

Combine multiple files and folders into a single ZIP archive — entirely in your browser.

runs locally

ZIP Extractor

Extract the contents of a ZIP archive and download the files — entirely in your browser.

runs locally

Image

Compress, convert, and rasterize images without uploading them.

AI Image Detector

Check whether an image was generated by AI (Midjourney, DALL·E, Stable Diffusion…) using a neural detector plus metadata forensics — all locally.

runs locally

AVIF to JPG Converter

Convert AVIF images to JPG online for free, even if your browser can't open AVIF.

runs locally

AVIF to PNG Converter

Convert AVIF images to lossless PNG online for free, preserving transparency.

runs locally

Background Remover

Remove the background from any photo with an AI that runs entirely in your browser.

runs locally

Barcode Generator

Generate Code 128, EAN-13, or UPC-A barcodes from text or digits and download them as PNG.

runs locally

Barcode & QR Scanner

Read QR codes and barcodes (EAN, UPC, Code 128, and more) from image files — entirely in your browser.

runs locally

BMP Converter

Convert BMP images to PNG or JPG, or turn any image into a BMP — entirely in your browser.

runs locally

BMP to JPG Converter

Convert BMP images to compact JPEG — entirely in your browser.

runs locally

BMP to PNG Converter

Convert BMP images to lossless PNG — shrink files 5-10×, entirely in your browser.

runs locally

EXIF Metadata Viewer

View the hidden metadata in your photos — camera, date, and GPS location — entirely in your browser.

runs locally

Favicon Generator

Turn any image into a multi-size favicon.ico plus individual PNG favicons — entirely in your browser.

runs locally

GIF to Frames

Split a GIF into individual frames and download them as PNG files.

runs locally

GIF Tools

A collection of free GIF tools: extract frames as PNG, reverse playback, and shrink file size — all in your browser.

runs locally

HEIC to JPG Converter

Convert iPhone HEIC/HEIF photos to JPG or PNG — entirely in your browser.

runs locally

Image Compressor

Shrink JPEG, PNG, and WebP images with a quality slider — processed locally in a Web Worker.

runs locally

Image Format Converters

A collection of free image format converters: PNG, JPG, WebP, and AVIF in every direction — all in your browser.

runs locally

Image Cropper

Crop any image interactively — drag the selection, lock an aspect ratio, export at full resolution.

runs locally

Image Resizer

Resize images to exact dimensions with high-quality scaling — entirely in your browser.

runs locally

Image Upscaler

Double an image's resolution with AI super-resolution that runs entirely in your browser.

runs locally

Image Watermark

Tile a text or logo watermark over any photo — adjust opacity, angle, and spacing.

runs locally

Images to GIF Maker

Combine a set of images into an animated GIF slideshow — choose the frame rate and width.

runs locally

JPG to AVIF Converter

Convert JPG images to AVIF online for free and shrink them dramatically.

runs locally

JPG to PNG Converter

Convert JPG images to lossless PNG online for free.

runs locally

JPG to WebP Converter

Convert JPG images to WebP online for free and save bandwidth.

runs locally

OCR — Image to Text

Extract text from images with OCR (printed & handwritten, 49 languages). Runs entirely in your browser — the image never leaves your device.

runs locally

GIF Optimizer

Shrink a GIF's file size by re-encoding it with a fresh palette, optionally downscaled.

runs locally

Paint

A classic paint program in your browser: pencil, brush, eraser, fill bucket, shapes, spray and text. Draw and save as PNG.

runs locally

PNG to JPG Converter

Convert PNG images to JPG online for free, with a quality slider.

runs locally

PNG to WebP Converter

Convert PNG images to WebP online for free, with adjustable quality.

runs locally

QR Code Generator

Generate QR codes for URLs, text, Wi-Fi, and more — download as PNG.

WebAssemblyCLI / agent

EXIF Remover

Strip the hidden metadata from photos — camera info, dates, and especially GPS location — by re-encoding them locally in your browser.

runs locally

GIF Reverser

Reverse the playback of an animated GIF so it plays backwards.

runs locally

SVG to PNG

Rasterize SVG files to PNG with a custom output width, right in your browser.

WebAssemblyCLI / agent

WebP to JPG Converter

Convert WebP images to JPG online for free.

runs locally

WebP to PNG Converter

Convert WebP images to PNG online for free, preserving transparency.

runs locally

Audio

Record, convert, denoise, and transform audio — processed locally in your browser.

Audio Converter

Convert audio files to WAV or MP3 entirely in your browser.

runs locally

Audio Cutter

Trim an audio file to a start and end time.

runs locally

Audio Noise Reducer

Reduce background hiss and noise from recordings with a noise gate.

runs locally

Voice Recorder

Record audio from your microphone and download it as a WAV file.

runs locally

Audio Speed Changer

Speed up or slow down audio without changing its pitch.

runs locally

Audio Tools

A collection of free audio tools: record, convert, remove noise, change voice and speed, boost volume, and cut — all in your browser.

runs locally

Audio Transcriber

Turn voice recordings, interviews, and voicemails into text with a local Whisper model — no audio ever leaves your device.

runs locally

M4A to MP3 Converter

Convert M4A audio (voice memos, iTunes) to MP3 entirely in your browser.

runs locally

M4A to WAV Converter

Convert M4A audio to uncompressed WAV for editing — entirely in your browser.

runs locally

OGG to MP3 Converter

Convert OGG (Vorbis/Opus) audio to MP3 — entirely in your browser.

runs locally

Text to Speech

Turn text into natural-sounding speech with Piper neural voices in 55 languages — running entirely in your browser. Your text never leaves your device.

runs locally

Voice Changer

Change the pitch of a voice recording — chipmunk, deep voice, or any custom amount.

runs locally

Volume Booster

Increase (or lower) the volume of an audio file, with soft clipping to avoid distortion.

runs locally

WAV to MP3 Converter

Shrink large WAV files to compact MP3 — entirely in your browser.

runs locally

Documents

Convert Word, PowerPoint, Excel, and other documents to Markdown — entirely in your browser.

DOC to Markdown

Convert legacy Word (.doc) documents to clean Markdown. Runs entirely in your browser.

runs locally

DOCX to Markdown

Convert Word (.docx) documents to clean Markdown. Preserves headings, lists, tables, and links. Runs entirely in your browser.

runs locally

EPUB to Markdown

Convert EPUB ebooks to Markdown, chapter by chapter. Runs entirely in your browser.

runs locally

ODP to Markdown

Convert OpenDocument presentations (.odp) to Markdown. Runs entirely in your browser.

runs locally

ODS to Markdown

Convert OpenDocument spreadsheets (.ods) to Markdown tables. Runs entirely in your browser.

runs locally

ODT to Markdown

Convert OpenDocument text files (.odt) to clean Markdown. Runs entirely in your browser.

runs locally

PPT to Markdown

Convert legacy PowerPoint (.ppt) presentations to Markdown. Runs entirely in your browser.

runs locally

PowerPoint to Markdown

Convert PowerPoint (.pptx) presentations to Markdown, slide by slide. Runs entirely in your browser.

runs locally

RTF to Markdown

Convert Rich Text Format (.rtf) files to clean Markdown. Runs entirely in your browser.

runs locally

Excel to Markdown

Convert Excel (.xlsx) spreadsheets to Markdown tables. Runs entirely in your browser.

runs locally

Office

Edit Word, Excel, and PowerPoint documents online — the engines run as WebAssembly in your browser, so your documents never leave your device.

Online Office Editor

Open, edit, and save Word (.docx), Excel (.xlsx), PowerPoint (.pptx) documents and annotate PDF files entirely in your browser. No upload, no account, no tracking.

runs locally

PDF

Merge, split, and convert PDF documents, 100% in your browser.

PDF Compressor

Shrink PDF files by re-encoding their pages at a lower DPI — choose the size/quality balance.

runs locally

PDF Editor

Open, annotate, and fill PDF forms entirely in your browser, then save the edited PDF back to your device. No upload, no account, no watermark.

runs locally

Image to PDF

Turn JPG, PNG, or WebP images into a single PDF — reorder pages, pick a page size, and download. Runs 100% in your browser.

runs locally

Merge PDF

Combine multiple PDF files into a single PDF, in the order you choose.

runs locally

PDF to Images

Render every PDF page to PNG or JPG, then download them individually.

runs locally

PDF to Text / Markdown

Extract text or structured Markdown from PDF files. Detects scanned/image-only PDFs. Runs entirely in your browser.

runs locally

Rotate PDF

Rotate all pages of a PDF by 90°, 180°, or 270°.

runs locally

Sign PDF

Add a handwritten, typed, or uploaded signature to any PDF page — no upload, no account.

runs locally

Split PDF

Split a PDF into single-page PDF files, all in your browser.

runs locally

Watermark PDF

Stamp a diagonal text watermark on every page of a PDF.

runs locally

Video

Trim and transcode video entirely in your browser.

Video Muter

Strip the audio track from a video without re-encoding (stream copy).

runs locally

Video Reverser

Reverse a video so it plays backwards — frames and audio both flipped.

runs locally

Video Compressor

Shrink a video's file size by re-encoding it — choose the size/quality balance.

runs locally

Video Cutter

Cut a segment out of a video without re-encoding (stream copy).

runs locally

Video Frame Extractor

Grab a single frame from a video at any timestamp and save it as a JPG image.

runs locally

Video Speed Changer

Change a video's playback speed — speed it up or slow it down — with audio kept in sync.

runs locally

Video to GIF Converter

Convert MP4, WebM, MOV and other video formats to an animated GIF.

runs locally

Video to MP3 Converter

Extract the audio track from MP4, WebM, MOV and other videos as an MP3 — entirely in your browser, no upload.

runs locally

Video to MP4 Converter

Convert WebM, MOV, AVI and other formats to MP4 (H.264/AAC).

runs locally

Video to WebM Converter

Convert MP4, MOV and other formats to WebM (VP8/Vorbis).

runs locally

Video Tools

A collection of free video tools: cut, convert to MP4/WebM, and turn video into GIF — all in your browser.

runs locally

Slides

Turn presentation decks into images or PDF.

Slides to Images/PDF

Export reveal.js or plain-HTML slide decks to PNG images or a single PDF.

runs locally

AI

On-device AI helpers that run locally in your browser. Chrome only — availability depends on your device.

AI Chat (Local)

Chat with an AI model that runs on your device — pick Chrome's built-in Gemini Nano or a local WebAssembly model. No account, no cloud.

runs locally

AI Data Extractor

Extract structured data (names, dates, amounts) from text with AI that runs entirely on your device — Chrome's built-in model or a local WebAssembly model.

runs locally

AI Rewriter

Rewrite or improve text with AI that runs entirely on your device — Chrome's built-in model or a local WebAssembly model. No cloud.

runs locally

AI Summarizer

Summarize any text with AI that runs entirely on your device — Chrome's built-in model or a local WebAssembly model. No cloud.

runs locally

AI Translator

Translate text between 12 languages with AI that runs entirely on your device — Chrome's built-in model or a local WebAssembly model. No cloud.

runs locally