Large File Uploads: How It Works and How to Resume

Large files don't upload all at once: above 90 MB, the upload is split into chunks (multipart upload). This makes the upload more stable, allows you to track real progress, and — most importantly — resumes where it left off if the connection drops.

How It Works Under the Hood

• Up to 90 MB, the file goes up in a single direct request to cloud storage;
• Above that, it's split into chunks that grow with the file size (from 5 MB to 80 MB per chunk for files over 1 GB);
• Each confirmed chunk is kept on the server; at the end, the chunks are joined and transcription begins.

Files go to cloud storage — European Union users have their files stored in European jurisdiction.

My Connection Dropped in the Middle. Did I Lose Everything?

No. Send the same file again: the system recognizes that upload was already in progress, checks which chunks arrived, and continues from the last completed chunk. You don't pay for the progress again in time or data.

Tips for Gigabytes

• Prefer stable Wi-Fi over cellular for 1 GB+ files;
• No need to convert first: long videos are accepted and audio is extracted on the server — but if your internet is slow, extracting audio locally (an MP3 is much smaller than the video) drastically reduces upload time;
• Multiple files at once: the upload queue handles parallelism on its own; keep the tab open until the queue empties;
• Plan limits: the per-file ceiling goes from 500 MB (free) to 5 GB (Pro and above) — see Accepted formats and limits.

What About After the Upload?

Very long files are processed normally — the Premium engine accepts up to 10 hours of audio in a single file, with no need to split anything. When internal chunking is needed, the platform does it on its own and merges the result.

Frequently Asked Questions

The upload has been stuck at the same percentage for a long time. What do I do?

Check your connection and reload the page; then send the same file again — it resumes from the last confirmed chunk.

Can I close my laptop during the upload?

Not during the upload (the upload starts from your browser). Once the upload completes and processing starts, you can close it — the rest happens on the server.

Is there a speed limit?

There's no artificial limit — speed depends on your connection. Parallel chunk uploads usually make good use of available bandwidth.

Why is my upload rejected before it even starts?

Probably the file exceeds your plan's size or duration limit, or you've hit the cap for simultaneous files. See Common upload problems.

Related Articles

• Accepted formats and limits
• Multiple files in batch
• Common upload problems
• Long files and processing

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