Upload images and documents

Upload files to a dataset to start annotating images or extracting text from documents. You need edit access to the dataset.

Upload files

Open the dataset. On an empty dataset, select Upload assets. Otherwise, select Upload in the header.
Drag your files onto Drag & drop files here, or select Choose files. Select Accepted files to see the formats and limits for this dataset.
Check the list. Remove a file with its remove button, add more with Add more files, or start over with Clear.
Select Upload n files. Each file shows its progress: Uploading…, Checking file…, then Uploaded or Upload failed.
When every file is done, select View dataset.

Keep the page open until the upload finishes. If you try to leave while files are uploading, your browser asks you to confirm. Files that finished uploading are already in the dataset, even if others fail.

Supported formats

The accepted formats depend on the dataset type.

Dataset type	Formats
Images	PNG, JPEG, WebP, GIF
Documents	PDF, PNG, JPEG (pages read with OCR)
Documents	TXT, MD, DOCX, ODT, RTF, HTML, EPUB, PPTX, XLSX, CSV, XML (text)
Documents	MP3, M4A, WAV (recordings)

Files in other formats are skipped before the upload starts.

Limits

Limit	Value
File size	Up to 100 MB per file, for every format
Image resolution	Up to 16 megapixels and 8,192 px per side
PDF length	Up to 1,000 pages per file
Text documents	Up to 1 MB of text after conversion

Uploaded files count toward your organization’s storage. When the storage is full, uploads fail until you free space or add storage in Billing. See Plans and credits.

What happens to your files

Images are stored as JPEG. Annota applies the EXIF orientation, fills transparent areas with white, and removes the file metadata. The pixel dimensions do not change. Uploading images uses no credits.
Documents are processed into text after upload. Text formats are converted for free (Free conversion). PDFs, scans, and recordings use credits: the upload page shows the cost per page or per minute and an estimate for the files you selected. If your balance looks too low, the page warns you with Not enough credits for this upload; processing stops when the balance runs out. See Documents and OCR and Credit usage.

Upload errors

When files fail, the page shows how many could not be uploaded. Fix the cause, then select Retry n files to try again.

Message	What to do
was skipped. Accepted formats: …	Convert the file to a supported format for this dataset type.
was skipped: it is over the 100 MB per-file limit	Compress or split the file.
The image could not be processed (max 16 megapixels, 8192 px per side)	Resize the image, or check that the file is a valid image.
The PDF is invalid or could not be processed	Open and save the PDF again, or export a new copy.
The PDF exceeds the 1000-page limit. Split it into smaller files.	Split the PDF.
The document could not be read or has no text	Check that the file opens and contains text.
The file exceeds the size limit: a text document can hold up to 1 MB of text	Split the document.
The audio file could not be read	Check that the recording plays, or export it again.
Storage is full. Free storage or manage your plan and add-ons in Billing.	Delete files you no longer need, or add storage.
Existing files are being measured. Try again when measurement completes.	Retry later.
Try uploading this file again.	Retry. If it keeps failing, check status.annota.ai.