Media
Converter
Convert images and videos between formats, or pull the audio out of a video. Everything runs in your browser — files never leave your device.
Upload Media
Images (PNG, JPG, WebP, GIF...) or Videos (MP4, WebM, MOV...)
ConverterUp's media converter changes the format of videos and images directly in your browser. Turn an iPhone MOV into an MP4 that plays everywhere, shrink a screen recording to WebM for the web, rescue an old FLV or WMV clip, convert a PNG to JPG or WebP, or pull the soundtrack out of a video as MP3. It runs FFmpeg compiled to WebAssembly on your own device, so nothing is uploaded, there is no queue, and private footage stays private.
Which video format should you pick?
MP4 (H.264 + AAC) is the safe default. It plays on every phone, TV, browser, social network and editing app. If you are not sure what the recipient uses, choose MP4.
WebM (VP8/VP9 + Vorbis/Opus) is the open web format. It is royalty-free and usually smaller than MP4 at similar quality, which makes it a good choice for videos embedded on your own website. Older Apple software has patchy support, so avoid it for files you send to iPhone users.
MKV is a flexible container that can hold several audio tracks and subtitles. It is ideal for archiving, but many phones and TVs will not play it — convert MKV to MP4 before sharing. MOV is Apple's container (what iPhones record); AVI and WMV are legacy Windows formats worth converting to MP4 for modern players.
Image formats: PNG, JPG, WebP, AVIF and more
JPG is best for photos: small files, universal support, but no transparency. PNG is lossless and supports transparency — use it for screenshots, logos and graphics with sharp edges.
WebP and AVIF are modern web formats. WebP is typically 25–35% smaller than JPG and supports transparency and animation; AVIF goes further still but takes longer to encode. Both are supported by every current browser.
GIF is limited to 256 colours — convert animated GIFs to MP4 or WebM to cut file size by 80–95%. TIFF and BMP are large, uncompressed formats from print and old Windows software; converting them to PNG or JPG makes them shareable. JFIF files are just JPEGs with a different extension and convert to plain .jpg.
Audio extraction, quality and limits
Switch on audio extraction to save only the soundtrack of a video as MP3, AAC, WAV or OGG — handy for podcasts, lectures, voice notes and music clips.
The quality slider controls compression: higher keeps more detail and produces bigger files. You can also set a width and height; with the aspect-ratio lock on, the image or video is scaled without distortion.
Because processing happens on your device, speed depends on your CPU and memory. The browser can handle videos up to 500 MB and images up to 50 MB. For larger files, trim or compress them first. Converting video is CPU-heavy — a desktop browser is noticeably faster than a phone.
Frequently asked questions
Are my files uploaded to a server?
No. Conversion runs entirely in your browser with FFmpeg compiled to WebAssembly. Your files never leave your device, which also means there is no upload wait.
Which formats are supported?
Video input: MP4, MOV, MKV, WebM, AVI, FLV, 3GP, TS, M4V, WMV. Video output: MP4, WebM, MKV, AVI, MOV. Images: PNG, JPG/JPEG/JFIF, WebP, AVIF, GIF, TIFF and BMP in both directions. Animated GIFs can also be converted to MP4 or WebM. Audio extraction: MP3, AAC, WAV, OGG.
What is the maximum file size?
500 MB for videos and 50 MB for images. These limits keep the conversion within the memory a browser tab can safely use.
How do I convert MOV to MP4?
Drop the MOV file, choose MP4 as the output and click convert. The video is re-encoded to H.264 with AAC audio, the most widely compatible combination.
Can I extract MP3 from a video?
Yes. After adding the video, enable audio extraction and choose MP3 (or AAC, WAV, OGG). Only the audio track is saved.
Is there a daily limit or watermark?
No. The converter is free with no daily limit, no watermark and no account.