About ConvertKiwi
ConvertKiwi is a free online file converter. It started from a simple frustration: changing a file from one format to another shouldn't mean installing an app, creating an account or staring at a spinner without knowing how long it will take.
Who runs ConvertKiwi
ConvertKiwi is built and maintained by Thiago, an independent developer based in Florida, United States. Every tool on the site is designed, tested and supported by him. If something doesn't work the way you expect, you can write directly to contact@convertkiwi.com.
What you can do here
- Images: convert between WEBP, PNG and JPG in any direction, open iPhone HEIC and AVIF photos as JPG or PNG, resize to exact pixels and shrink photos with the image compressor.
- PDF: turn PDF pages into JPG or PNG images, combine images into a PDF, merge, split, rotate and compress PDFs. Splitting, rotating and PDF to image run inside your browser.
- Video and audio: MP4 to MP3, video to GIF, a video compressor, MOV to MP4, WAV and OGG conversions and more.
- Speech to text: automatic subtitles you can edit and burn into the video, and transcripts of video or audio files. The speech recognition (Whisper) runs on our own server.
- Also: a background remover for photos, a QR code generator for links and Wi-Fi, and the transcript of YouTube videos that have captions, with clickable timestamps and TXT or SRT download.
How the tools are tested
Every tool is tried with real files before it goes live, and the output is checked by its actual file type, not just by whether a download appears. The guides on this site are written from those tests: when a guide says a photo ends up around 100 KB or a PDF shrinks to a certain size, that number comes from running the same settings the tool uses. If you find a case where a tool or a guide is wrong, please write to us and it will be fixed.
Why it is free
There is no paid plan and no account. The server costs are meant to be covered by advertising. Ads will never be placed to look like a download or convert button, and nothing on the site asks you to click them.
How we handle your files
Files are processed only to create the result you asked for. Standard server conversions delete uploads when processing ends and remove results 30 minutes later. Other server workflows keep their job files until expiry and schedule deletion 30 minutes after processing or the most recent request that extends the job. Browser-only tools never upload your files. The details are in our Privacy Policy.
Built on open-source software
ConvertKiwi stands on the shoulders of excellent free software: FFmpeg for video and audio, libvips (through sharp) for images, pdf-lib for building PDFs and Mozilla's pdf.js for reading them. We are grateful to the people who maintain these projects.