100% client-side processing

Free Online Tools, 100% Private.

120+ tools that process PDFs, images, video, code, and data entirely in your browser. Nothing uploaded. Nothing tracked.

Browse all tools →How it works

122+Free tools

0Server uploads

0Signups needed

Technical standards we follow

brevtool is built on open web standards and browser APIs for local-first processing and privacy.

WebAssembly powers high-performance in-browser processing.
File API and related browser APIs keep files local on your device.
W3C File API specification defines how files are handled inside the browser runtime.

Most used

Popular tools

View all 122+ tools →

Merge PDF

Combine multiple PDF files into one document — entirely in your browser, no uploads.

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Compress Image

Reduce image file size while preserving quality — no uploads, browser only.

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QR Code Generator

Generate QR codes for URLs, text, email, and more — entirely in your browser.

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JSON Formatter

Format, validate, and minify JSON data in your browser. Supports syntax highlighting.

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MP4 to MP3

Extract audio from video files and save as MP3, entirely in your browser.

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Password Generator

Generate strong, random passwords with customizable length and character sets.

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Hash Generator

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text — entirely in your browser.

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JSON to CSV

Convert JSON to CSV online free. Paste or upload JSON arrays and download CSV files instantly.

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Explore

Browse by category

Ten categories of tools, each processing entirely in your browser.

Why brevtool

Why Choose Browser-Based Tools?

Zero-upload architecture

Every tool processes files using WebAssembly directly in your browser. Your data never touches our servers. Not even metadata.

Instant processing

No upload progress bars. No waiting. Drop your file and get results in milliseconds — processing starts the moment you interact.

No strings attached

No signup. No watermarks. No file size limits. No "upgrade to Pro" walls. Every tool is completely free. Forever.

What is brevtool?

brevtool is a suite of 122+ free online tools that run entirely in your browser. When you pick a file, it is read into memory via the HTML5 File API and handed directly to an in-browser engine — no upload, no server copy, no account.

Under the hood: WebAssembly runs FFmpeg, pdf-lib, libwebp, and Hugging Face Transformers at near-native speed; the Canvas and Web Audio APIs handle previews and mixing; SharedArrayBuffer unlocks multi-threaded encoding on supported tools. No file uploads, no tracking of your tool inputs — your files never leave your device.

Because files never reach a server, brevtool has nothing to leak and nothing to retain — useful for contracts, medical records, tax filings, and anything covered by GDPR or HIPAA. Every tool is free with no signup, no watermark, and no size ceiling beyond what your device memory allows. After the initial page load, most tools keep working offline.