Last updated: September 15, 2026
These limits keep VelloDoc fast and reliable for everyone. Knowing them before you upload saves failed attempts.
File size
A single job can upload up to 80 MB. When a tool accepts several files, like Merge PDF, the limit applies to all of them together.
Processing time
Each job can run for up to 5 minutes. Very long documents, OCR on many pages and large office files are the jobs most likely to reach this limit. Splitting the document usually helps.
How often you can use the tools
- 60 processing jobs per IP address every 15 minutes.
- 120 PDF inspections per IP address every 15 minutes. An inspection reads the page count and form fields when you add a PDF.
- 12 contact messages per IP address per hour.
If you reach a limit, wait a few minutes and try again.
Number of files
There's no fixed number of files. The total size limit applies. Merge PDF, Scan to PDF and the image converters accept several files at once, Compare PDF needs exactly two, and the other tools work on one file per job.
Supported formats
- PDF tools: PDF files.
- Office documents: DOC, DOCX, XLS, XLSX, PPT, PPTX, ODT, ODS, ODP and RTF.
- Images: JPG, PNG, WebP, HEIC and HEIF, TIFF, BMP and SVG.
- Text and data: TXT, CSV, Markdown, HTML, JSON and XML.
- Other: DRM-free EPUB ebooks, EML email files and public web page addresses.
Password-protected PDFs
When you add a protected PDF, a PDF password field appears. Enter the password there. One password is used for the whole job, so when merging files that have different passwords, unlock them first with Unlock PDF.
OCR
OCR PDF recognizes 39 languages, up to two in one run. Every page without text is drawn at about 250 DPI and recognized in turn, so long documents take longer and are more likely to reach the processing time limit.
Images
Images larger than 6,000 pixels on their longest side are scaled down to that size when they're placed in a PDF.
Compress to Target Size
The tool accepts targets from 0.1 MB to 100 MB and counts 1 MB as 1,048,576 bytes. If no attempt reaches the target, you receive the smallest version that could be made. The pages for common limits, like 500 KB and 1 MB, count in decimal bytes, so their results also fit forms that use the stricter definition.
Web Page to PDF
Only public http and https addresses can be converted. Private, local and internal network addresses are refused, including after redirects. Each resource the page loads is limited to 25 MB and must respond within 20 seconds.
Results with several files
When a tool produces more than one file, like Split PDF with page ranges or PDF to JPG, the files are downloaded together in a ZIP archive.
Share links and AI
Share links work with PDFs up to 25 MB and 300 pages, and last up to 7 days. The AI PDF Workspace reads up to 20 PDFs at a time and uses about 300,000 characters of text per question. The number of AI questions per hour and per day is limited so the service stays available for everyone.