Why Convert MP4 to MP4? Re-Encoding, Explained With Data
People convert MP4 to MP4 thousands of times a month. It's not pointless—re-encoding shrinks, repairs, or swaps the codec in…
September 2026
How Much Does Compression Actually Save? Real Data by Format
We measured 150,000+ compression jobs: how much each format really shrinks, from TIFF (85%) to HEIC (25%), and why results…
Why Won’t My WebP, HEIC, or AVIF Upload? Compatibility Fix
WebP, HEIC, and AVIF get rejected by upload forms that only accept JPG/PNG. See the caniuse compatibility table and the…
Container vs Codec: Why Renaming .MKV to .MP4 Doesn’t Work
A container (MP4, MKV) is the box; a codec (H.264, HEVC) is what's inside. Here's why renaming .MKV to .MP4…
Video Washed Out After Converting? Fix the HDR to SDR Look
iPhone video washed out after converting? It's HDR (Dolby Vision) shown as SDR without tone-mapping. Here's why it happens and…
Audio Out of Sync After Converting a Video? Why & How to Fix
Audio out of sync after converting a video? The usual cause is variable frame rate. Here's why it drifts and…
Why Is My File Bigger After Converting? Causes and Fixes
Converted a file and it got bigger instead of smaller? The 5 causes, from lossy-to-lossless to a weaker codec, and…
Make Your iPhone Shoot JPG and MP4 Instead of HEIC/HEVC
Switch Settings → Camera → Formats to Most Compatible and your iPhone captures new photos as JPG and video as…
How to Send a Video That’s Too Big to Email: 7 Easy Ways
Video won't attach? 7 ways to send a video too big to email — compress under Gmail's 25 MB cap,…
Best Video Format for YouTube: Settings, Codec & Bitrate
The best format for YouTube uploads is MP4 (H.264 + AAC-LC). See YouTube's recommended bitrate ladder by resolution and how…