Compress PDF for KRA iTax (Kenya)

Filing on the Kenya Revenue Authority's iTax portal (itax.kra.go.ke) often means attaching supporting documents — withholding certificates, financial statements, exemption proofs, audited accounts — and the portal limits how large each attachment can be. Exported or scanned PDFs frequently exceed that cap, and a rejected attachment can hold up a return right at the filing deadline. If you need to compress a PDF for KRA iTax, sizing each file to the exact figure iTax allows is the dependable fix.

What iTax asks you to attach — and the size limits

The attachments depend on the return or application, but common ones include:

• Withholding tax certificates and other deduction proofs, as PDFs.
• Financial statements / audited accounts for income-tax returns.
• Supporting documents for exemptions, refunds or objections, as PDFs.
• PIN-related and registration documents for certain applications.

iTax states a maximum size per attachment, and a multi-page financial PDF or a scanned certificate can easily go over it. The figures are set by KRA and can change, so check the current screen — but the pattern is the same: the attachment must come down to a specific size before it will go through.

How to compress your iTax attachments to the exact size

1. Save or export the document as a single PDF.
2. Open PdfXpo's Compress to Exact Size tool and add the PDF.
3. Type the iTax limit as your target.
4. Compress, confirm the figures and stamps are readable, and download. The file lands within about 2% of your number.

Tax records have to stay legible — amounts, certificate numbers and signatures must all be clear — so PdfXpo preserves the content while removing the redundant data that inflates a scanned or exported PDF.

Fixing the most common iTax upload errors

• "Attachment exceeds maximum size" — compress the PDF to the exact allowed size and re-attach.
• "Invalid file type" — make sure the attachment is a PDF where iTax expects one.
• Figures unreadable on review — a scan over-compressed elsewhere can be rejected; the exact-size approach keeps numbers crisp.
• Session times out on upload — a smaller, exactly-sized file attaches faster and is less likely to fail before your iTax session expires.

A checklist before you file on iTax

• Each attachment saved as its own clearly-named PDF.
• Every PDF compressed to the exact iTax size limit.
• Compressed files opened and checked — amounts and stamps legible.
• Financial documents handled privately — nothing uploaded to a third party.
• Originals kept for your records.

A worked example

Filing a return, you need to attach audited accounts exported at 4.0 MB, but iTax caps the attachment well below that. Your session is ticking down. You compress the PDF in PdfXpo to the allowed size — it lands within about 2% — and the attachment uploads before the session expires, with every figure and signature still crisp. Because it runs locally, your financial statements never pass through anyone else's cloud.

How PdfXpo hits an exact file size — and why presets cannot

Almost every "compress PDF" tool online gives you three vague buttons — low, medium or high. You pick one, wait, download, and only then discover the new size, which is almost never the figure a portal demands. PdfXpo's exact-size mode is built the opposite way round. You type the size you actually need — 20 KB, 50 KB, 200 KB, 300 KB or 1 MB — and the engine works backwards from that target, testing compression levels until the file lands within roughly 2% of it. There is no trial and error and no re-uploading a PDF that is still a few kilobytes too big. You get a document that clears the limit on the first attempt while staying as sharp and legible as the size allows.

Why "file too large" keeps coming back

Three different problems all show up as the same red error, and only one of them is fixed by compressing:

• Size — the PDF is over the portal's KB or MB cap. This is the one an exact-size compressor solves.
• Dimensions or page count — some portals also limit the page size or the number of pages in a single upload.
• Format — the portal wants a PDF and you uploaded a JPG (or the other way round).

If compressing the file does not clear the error, the problem is dimensions or format rather than size — and knowing which one you are hitting saves a great deal of guesswork at the upload screen.

Documents are PDFs; photos and signatures are images

This is the single most common mix-up on exam and government portals, and it is worth getting right. A passport photograph and a specimen signature are usually JPEG images with their own tiny KB limits. Certificates, mark sheets, declarations, statements, ID scans and the application form itself are PDF documents. PdfXpo is a PDF tool, so it is the right fit for the document side — shrinking a scanned certificate or a multi-page form to the exact PDF size the portal accepts. For a JPEG photo or signature you would use an image resizer instead. Uploading the wrong file type, or compressing the wrong thing, is the usual reason an upload still fails after you thought you had already "compressed" it.

Your documents never leave your device

Everything PdfXpo does runs locally inside your browser through WebAssembly. When you compress an income certificate, an Aadhaar or national-ID scan, a degree certificate or a bank statement, the file is processed in your own browser's memory and is never sent to any server — unlike Smallpdf, iLovePDF or Adobe, which upload your file to their cloud to process it. For identity and financial paperwork that is precisely the guarantee you want. You can confirm it yourself: open your browser's developer tools, switch to the Network tab, and compress a file — you will see no request carrying your document's contents leave the page. It is also completely free, with no sign-up, no email, no watermark and no daily limit, so you can prepare an entire application's worth of documents in one sitting.

How small is too small? Balancing the limit and readability

It is tempting to compress as hard as possible "to be safe", but going far below a portal's limit can backfire: a certificate squeezed to a fraction of the cap may turn blurry and be rejected at verification for being unreadable. The goal is not the smallest possible file — it is a file that sits comfortably under the limit while staying perfectly clear, and that is exactly what compressing to an exact size gives you. If a portal allows 300 KB, target 300 KB (or a touch under), not 50 KB; you keep the maximum quality the rule permits. Scanning well in the first place helps too: a flat, evenly-lit scan at a sensible resolution compresses far more cleanly than a dark, skewed phone photo, so you reach the target size with more detail intact. When in doubt, compress, open the file, and read it at 100% before uploading — thirty seconds of checking saves a rejected application.

Official source, accuracy and last review

Upload-size rules change between cycles and portal updates, so always confirm the current figures on the official KRA iTax portal before you submit — this guide explains the method, but the portal's own notification is the final word. PdfXpo is a free, in-browser PDF toolkit; for the underlying tools see Compress PDF and Compress PDF to an exact size. Related size guides: compress a PDF to 50 KB for a form and compress a PDF to 20 KB. This page is maintained by the PdfXpo team and was last reviewed in June 2026.