Guide
A generic upload error does not prove the file is still too large. Check the receiving site's rules in a fixed order so you do not damage the document while solving the wrong problem.
Compare the downloaded file's byte size with the portal's stated boundary. Some interfaces display rounded MB values while enforcing an exact byte count. Leave a buffer rather than relying on a display that says exactly 1.0 MB.
Open the download in a second PDF viewer. If it will not open, has a zero-byte size, requests an unexpected password, or reports damaged content, do not submit it. Return to the original and try a gentler mode or a fresh export.
Portals can enforce page count, page dimensions, PDF version, encryption, password protection, electronic signatures, or PDF/A requirements. PDF Limit changes size; it does not certify those separate rules. The portal's documentation remains authoritative.
Use a short filename with letters, numbers, hyphens, or underscores and keep the .pdf extension. Some older forms mishandle long names, multiple periods, emoji, accented characters, or an extension that does not match the actual file type.
An expired form session, blocked script, network interruption, or stale page can produce the same visible error as a rejected document. Save form text if needed, refresh or sign in again, and retry the already verified PDF before compressing it more.
If an image-heavy file cannot reach the target legibly, remove unused pages or rescan only the needed pages in grayscale at a sensible resolution. For text documents, return to the source application and export a clean PDF without oversized images or unnecessary embedded assets.