Why Upload Forms Reject Valid PDFs and How Target-Size Compression Helps

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Upload forms frequently reject perfectly valid PDF files solely because they exceed fixed size limits, commonly set at 10 MB, 20 MB, or 25 MB. This issue affects a wide range of use cases, including job applications, portfolio submissions, client portals, and support ticket attachments. While standard advice suggests compressing the PDF, users typically need a more precise outcome — reducing the file to a specific size while preserving acceptable visual quality. A developer identified this gap and built TinyPDF, a focused tool that lets users input a target file size, compress the PDF, and inspect the result before submitting. The experience highlights a broader design question for developers building upload flows: whether to communicate file-size limits before or only after an upload attempt fails.

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