Every accepted format, by type
| File type | Accepted formats | Notes |
|---|---|---|
| Video | MP4, MOV, WEBM, M4V, 3GP, ASF, AVI, F4V, FLV, HEVC, M2TS, M2V, MJPEG, MKV, MPEG, MPG, MTS, MXF, OGV, SWF, TS, WMV, WTV, 3G2, RM, VOB | Container is not the whole story; codec matters (see below) |
| Audio | AAC, MP3, M4A, FLAC, OGG, WAV, AIFF, WMA, OPUS | None stated |
| Image | PNG, JPG, JPEG, WEBP, SVG, GIF, BMP, ICO, PSD, RAW, HEIC, TIF, TIFF, PCD, AI | GIFs must be within 500 frames |
| Subtitle upload | SRT, VTT, LCR, SSA, ASS, SUB, SBV | As listed by FlexClip |
| Subtitle download | SRT, VTT, SSA, ASS, SUB, SBV, TXT, CSV | TXT and CSV are export-only |
| Font | TTF, OTF, WOFF, WOFF2 | None stated |
| LUT | CUBE | None stated |
Upload size and length: what FlexClip does and does not publish
FlexClip's formats article gives no file size, duration or resolution limit for uploads; the only stated cap is 500 frames for GIFs. Its plan benefits article also does not list a per-file upload size. We could not confirm a per-file limit from FlexClip's own pages on 30 October 2026, so we are not quoting one. If you work with very large source files, test one upload on the free plan before paying.
What FlexClip does publish is per-plan limits on finished video length, storage and export resolution:
| Plan | Video length | Cloud space | Video hosting space | Export resolution |
|---|---|---|---|---|
| Free | Up to 10 minutes | Not listed | Not listed | 720p HD |
| Plus | Unlimited | 30 GB | 100 GB | 1080p Full HD |
| Business | Unlimited | 100 GB | 1 TB | 4K Ultra HD |
Why an MP4 can still fail: the codec catch
FlexClip's help says upload or transcoding problems are usually about the video's encoding, not its file extension. Two files can both end in .mp4 and use different codecs. FlexClip's own example: MP4 with H.264 is supported, while MP4 with the older MPEG4 codec is not and must be transcoded.
FlexClip says it usually transcodes unsupported files automatically. If a file still fails, its advice is to convert it to a supported format and encoding with a video converter and upload again. In practice, re-encoding to MP4 with H.264 video is the safe target, because that is the combination FlexClip names as supported.
Preparing phone and screen-recorder files
Phone footage: HEVC appears in FlexClip's video list and HEIC in its image list, so recent iPhone and Android files are formats FlexClip names. The practical concern is size and resolution: 4K phone clips are large to upload and only export at 4K on the Business plan; Free exports at 720p and Plus at 1080p. If you will export at 1080p, there is little reason to upload 4K masters on a slow connection.
Screen recordings: MP4, MOV, WEBM and MKV are all accepted containers, but screen recorders vary in codec. If a recording fails, re-encode it to H.264 MP4. Trim dead time before uploading: a 40-minute recording you will cut to 8 minutes still has to upload in full.
- Check the codec, not just the extension; aim for H.264 in an MP4 container.
- Match upload resolution to your plan's export resolution (720p Free, 1080p Plus, 4K Business).
- Trim long recordings before upload to save time and cloud space.
- Keep Free-plan projects under 10 minutes of finished video.
- Keep GIFs within 500 frames.
- Export subtitles as SRT or VTT if you will reuse them on YouTube or another platform.
Browser and computer requirements
FlexClip says it works best on Google Chrome, Firefox and Safari, and strongly recommends Chrome for the best performance and most stable experience. Other browsers can be used, but some features may be less stable. No version numbers are listed.
For hardware, FlexClip recommends at least a 10th-generation Intel Core i3 (or newer) and 8 GB RAM. It says a lower-spec computer may manage short videos of about three minutes or less at standard resolution with few effects, while longer videos, HD or 4K footage, and projects with many effects or AI features need a more powerful machine.
The 'Browser Storage Full' error
Because FlexClip caches project files and drafts in the browser, it can show a Browser Storage Full prompt when the computer's system drive is nearly full. FlexClip's first fix is to free roughly 5 to 10 GB on the system drive, then click OK on the prompt. Its second and third fixes, clearing site data in developer tools or removing FlexClip's site data in browser settings, erase unsynced drafts, and the third also logs you out, so try freeing disk space first.
Questions before you decide
What video formats can I upload to FlexClip?
FlexClip lists MP4, MOV, WEBM, M4V, 3GP, ASF, AVI, F4V, FLV, HEVC, M2TS, M2V, MJPEG, MKV, MPEG, MPG, MTS, MXF, OGV, SWF, TS, WMV, WTV, 3G2, RM and VOB. The codec still matters: H.264 MP4 is supported, MPEG4-codec MP4 is not.
Is there a file size limit for FlexClip uploads?
FlexClip's help articles on supported formats and plan benefits did not state a per-file upload size limit when checked on 30 October 2026. Published limits are finished video length (10 minutes on Free) and cloud space (30 GB Plus, 100 GB Business).
Why won't my MP4 upload to FlexClip?
FlexClip says failures usually come from the encoding, not the extension. An MP4 using the MPEG4 codec is not supported; FlexClip usually transcodes automatically, and if that fails, convert the file to a supported encoding such as H.264 and upload again.
Which browser should I use for FlexClip?
FlexClip says it works best on Chrome, Firefox and Safari, and strongly recommends Google Chrome for the best performance and stability.
Sources & verification
Product details and prices can change. Check the linked provider before buying.
- FlexClip Help: Supported video, audio, image, font, subtitle and LUT file formats Accessed 30 Oct 2026
- FlexClip Help: Why can't my video be transcoded or uploaded successfully? Accessed 30 Oct 2026
- FlexClip Help: Video editor plan benefits Accessed 30 Oct 2026
- FlexClip Help: What browsers does FlexClip support? Accessed 30 Oct 2026
- FlexClip Help: What are the minimum system requirements? Accessed 30 Oct 2026
- FlexClip Help: How to resolve the browser storage full issue Accessed 30 Oct 2026
Sources link directly to providers. Product buttons may use separately labeled affiliate links. Read our disclosure.