- Home
- About donustur.io
About donustur.io
donustur.io is built to convert your files for free, with no sign-up. Every conversion has its own page, its own settings and the facts that matter for it.
Why donustur.io?
Most conversion sites make you wait in a queue, ask for your email address, stamp a watermark on the result or set a daily limit. donustur.io does none of that: drop the file, choose the target format, and the result saves to your computer or phone in seconds.
Every conversion has its own page. JPG to PDF, Word to PDF or MP4 to MP3: the page for the conversion you need brings together the right settings, a comparison of the two formats and the common questions.
Why some conversions take a moment the first time
To keep pages fast, heavy conversions such as PDF, HEIC and video take a few seconds to get ready the first time. Legacy formats such as AVI, WMV, FLV, WMA and AIFF take a little longer. After that, conversions start right away.
Open-source libraries
| Library | Job | License |
|---|---|---|
| PDF.js | Reads and renders PDF pages | Apache-2.0 |
| pdf-lib | Builds PDFs from images; merges and splits PDFs and assembles compressed pages | MIT |
| pdfmake | Typesets documents and tables into PDF | MIT |
| html-to-pdfmake | Maps HTML onto PDF layout | MIT |
| Mediabunny | Converts audio and video (MP3, AAC, FLAC encoders included) | MPL-2.0 |
| ffmpeg.wasm | Legacy formats such as AVI, WMV, FLV, WMA and AIFF | MIT (FFmpeg: LGPL/GPL) |
| SheetJS Community Edition | Reads and writes Excel, ODS and CSV | Apache-2.0 |
| mammoth.js | Reads Word documents | BSD-2-Clause |
| docx | Writes Word documents | MIT |
| marked | Turns Markdown into HTML | MIT |
| Turndown | Turns HTML into Markdown | MIT |
| js-yaml, smol-toml, fast-xml-parser | Read and write YAML, TOML and XML | MIT, BSD-3-Clause, MIT |
| heic-to (libheif) | Opens iPhone HEIC photos | LGPL-3.0 |
| jSquash | Encodes AVIF and WebP | Apache-2.0 |
| UTIF.js, gifenc, gifuct-js | Read and write TIFF and GIF | MIT |
| ImageTracer.js | Traces images into SVG vectors | Unlicense |
| fflate | Zips multi-file results | MIT |
| Archivo | The site’s typeface (Omnibus-Type) | OFL-1.1 |
Privacy
See the privacy page for details.