Free Audio & Video Online
Audio and video utilities: MP4-to-MP3 extraction, video-to-GIF conversion, audio and video trimming, GIF compression, MP3 normalization. Powered by FFmpeg.wasm in the browser.
6 free tools — browser-based, no sign-up required.
GIF Compressor
Compress GIF file sizes
Audio Cutter
Cut and trim audio files
Video Cutter
Cut and trim video files
MP3 Normalizer
Normalize MP3 audio volume
File Viewer
View various file formats online
Duplicate File Finder
Find duplicate files
About FlexyPdf Audio & Video
Audio and video processing used to mean installing FFmpeg, learning a complex command-line interface, or paying for a desktop encoder. FFmpeg.wasm changed that — FFmpeg is now compiled to WebAssembly and runs directly in the browser, which is what powers most of the media tools here. The trade-off is that processing happens on your device, which means files do not get uploaded but a long video takes as long as your laptop's CPU needs to encode it.
For extracting audio, the MP4-to-MP3 tool transcodes the audio track at a quality you specify (128/192/320 kbps) and offers VBR mode for smaller files at equivalent quality. The video trimmer cuts a clip without re-encoding when possible (using stream copy), so trimming a long video is near-instant rather than re-encoding the whole thing. The audio trimmer offers waveform-based selection with sub-second precision, useful for cutting clean podcast clips.
The video-to-GIF converter produces optimized GIFs with palette extraction and frame deduplication, so the output is significantly smaller than naïve frame-by-frame conversion. The GIF compressor reduces existing GIFs without visible quality loss. Audio normalization adjusts loudness to a target LUFS level (the broadcast standard), useful for evening out volume between recordings without crushing dynamic range.
Who uses these tools
A few of the recurring use cases we hear about from FlexyPdf visitors.
Podcasters and audio editors
Trimming a recording before publishing, normalizing volume between episodes, extracting audio from video interviews.
Social media creators
Converting short video clips to GIFs for embedding on platforms that prefer GIF over video, trimming long recordings down to platform length limits.
Educators and trainers
Extracting audio from a recorded lecture for podcast distribution, cutting demo videos into bite-sized segments.
Anyone with a quick edit need
Cutting a 30-second highlight out of a long video, shrinking a GIF that's too large to email or attach to a chat.
Frequently asked questions
Why does video processing take longer than uploading to an online converter?
Online converters use server-side hardware-accelerated encoders. Browser-based FFmpeg uses your CPU. The trade-off is that nothing leaves your device — for sensitive footage that's often worth the wait.
Is there a file size or duration limit?
There is no hard server-side limit because nothing is uploaded. The practical limit is your device's memory — most browsers handle videos up to a few GB without issue, but multi-hour 4K footage may slow down or run out of memory.
Can I convert formats my browser does not support?
Yes — FFmpeg.wasm includes its own decoders for most common formats, so you can convert, say, an MKV file to MP4 even if your browser cannot play the MKV directly.