We re-package or re-encode your MP4 into the AVI container. When the codec matches, we copy streams (fast, lossless); when it does not, we re-encode with H.264 / H.265 / VP9 at a high default quality.
Is converting MP4 to AVI lossy?
+
If the codec inside MP4 is compatible with AVI, the conversion is a remux (no quality loss). If we need to re-encode, the default CRF setting is visually lossless for typical viewing distances.
Yes when AVI supports them (MP4, MKV, MOV). All audio tracks, languages, and embedded subtitles are kept. For single-track containers (3GP, FLV), only the default track survives.
How big can my MP4 file be?
+
Free accounts have a size limit that varies by file type; PRO accounts allow much larger files. For very large MP4 files we recommend the PRO plan or pre-trimming with our video-trim tool.
What codec is used inside the AVI output?
+
We pick the best-supported codec for the AVI container — H.264 for MP4 / MOV / FLV, VP9 for WebM, AV1 when targeting modern web, H.265 when AVI supports it. You can override in the options panel.
Will my converted AVI play on TV, phone, and browser?
+
Yes. Our default profile targets universal playback — H.264 + AAC inside AVI works on every major platform, browser, and smart TV from the last decade.
Is the MP4 to AVI converter free?
+
Yes, within the free size limit. PRO unlocks larger files, GPU-accelerated transcoding, and 4K output.
Does PDF.to support 4K and HDR MP4 files?
+
Yes. 4K is preserved by default; downscale via the options panel if needed. HDR is preserved when AVI supports it (MKV, MP4 with HEVC) or tonemapped to SDR when targeting older formats.
How long does a MP4 to AVI conversion take?
+
د جریان کاپي (متوافق کوډ) د ډیسک سرعت ته نږدې پای ته رسیږي - د 1 GB فایل په ښه توګه د دقیقې لاندې. د حل او اوږدوالي سره د بیا رمز کولو پیمانه؛ د وړیا پلان لپاره د 1080p لپاره په سمه توګه ریښتیني وخت تمه وکړئ، په PRO کې ګړندی.
Do you keep my MP4 video?
+
No. The MP4 upload and AVI output are deleted within an hour. Conversion happens in an isolated worker with no content logging.
