About Ajee Convert

Ajee Convert exists to answer a specific frustration: most online converters ask you to upload a private file to a stranger's server, wait in a queue, and then hand you back a file with a watermark and a compressed-quality ceiling you were never told about.

Every tool here runs in your own browser. Audio is decoded by the Web Audio API, images are processed on a canvas, and video is handled by FFmpeg compiled to WebAssembly. Font files are parsed byte by byte in JavaScript. Your files are read from your disk, processed in memory, and never transmitted anywhere — because there is no server to transmit them to.

What we do differently

No uploads. Files are read with the File and Blob APIs and processed locally. Nothing is transmitted, so there is no privacy policy clause about your data because there is no data to hold.

Real converters. Every tool performs a genuine operation — MP3 output is written by a real MPEG-1 Layer III encoder, WOFF files are built with actual zlib-compressed tables, spectrograms come from a real FFT.

Honest limits. Where a browser genuinely cannot do something — identifying a font from a photo, extracting subtitles from a container, converting TrueType outlines to PostScript ones — the page says so and explains the alternative instead of showing a button that fails.

Measured numbers. Sample rates, bitrates, peak levels and file sizes are read from the decoded media and reported, not estimated from a filename.

No accounts, no quotas, no watermarks. There is nothing to sign up for and no premium tier waiting behind the download button.

How the tools work

Audio conversion decodes your file to PCM with the Web Audio API, re-renders it offline at the sample rate and channel layout you choose, and encodes the result. MP3 and WAV encoding is done in JavaScript; FLAC, M4A, OGG and Opus use the FFmpeg WebAssembly engine.

Video conversion uses FFmpeg compiled to WebAssembly, running on the single-threaded core so no special server headers are required. Native containers such as MP4 and WebM are decoded by the browser directly where that is faster.

Image tools use the browser's canvas pipeline for decoding, resampling and encoding, which means hardware-accelerated scaling and correct alpha channel handling.

Font tools parse the SFNT table directory, name table, head, maxp, OS/2 and cmap tables directly from the binary, and write genuine WOFF containers with per-table compression.

Media checkers read container headers — RIFF chunks, MPEG frame headers, FLAC streaminfo, MP4 box trees and Matroska EBML — and combine those declared values with measured ones from the decoded stream.

Who it is for

Podcasters and audio editors who need to hit a specific bitrate or sample rate without installing software. Video creators who need a quick container change or a compressed delivery copy. Web developers who want a smaller image or a WOFF font without opening a terminal. Anyone who has ever been asked to email a file that is too large.

What it costs

Nothing. There is no account to create and no card to enter. The site is supported by advertising, which is why you will see clearly marked ad spaces on the pages. They never overlap a control, a result or a download button.