Japanese Tax Return PDF Too Large? How to Compress It for Free

Filing your annual tax return in Japan through e-Tax and hit the dreaded "file size exceeds the limit" error? Scanned receipts, medical expense statements, and hometown tax (furusato nozei) certificates can make PDFs unexpectedly large. This guide shows you how to compress those PDFs for free so they clear e-Tax's size limits.

e-Tax Has a File Size Limit for PDF Attachments

When submitting supporting documents as PDFs through e-Tax (Japan's National Tax Agency electronic filing system), you need to stay within these limits:

The 14 MB cap is where most people run into trouble. High-resolution scans and multi-page documents can blow past it easily.

How to Compress a Tax Return PDF

Method 1: Use an Online Compressor (Recommended)

The fastest approach is a browser-based PDF compression tool.

With sakutto's PDF compressor, it takes just 3 steps:

1. Add your file: Drag and drop the tax document PDF
2. Choose compression level: Select "Standard" to meet e-Tax's resolution requirements while reducing size
3. Download: Save the compressed PDF and attach it in e-Tax

Method 2: Optimize Your Scan Settings (Prevention)

You can keep file sizes down from the start by adjusting your scanner settings:

For text-heavy documents, 200 dpi is perfectly readable. Reserve 300 dpi for pages with photos or detailed charts.

Method 3: Split and Submit in Multiple Batches

If compression alone isn't enough, split the PDF into smaller files and use e-Tax's multi-submission feature (up to 11 transmissions, 154 MB total).

Internal link: PDF splitter tool

Choosing the Right Compression Level

Here's a quick guide for tax documents:

For most tax return attachments, "Standard" hits the sweet spot — typically reducing file size by 50–70% while keeping text sharp enough for review.

Important Reminders

Keep the Original File

Compression is irreversible. Always save a copy of the original PDF. In Japan, tax-related documents must be retained for at least 7 years, so preserving the source data matters.

Verify the Compressed Output

Open the compressed PDF and check:

• Text is not blurry
• Amounts and dates are clearly readable
• Seals and stamps are legible

Remove Passwords Before Compressing

Password-protected PDFs cannot be compressed directly. Remove the password first, compress, then re-apply protection if needed.

FAQ

Can I compress my tax return PDF for free?

Yes. sakutto's PDF compressor is completely free — no sign-up, no usage limits. Just open it in your browser and compress.

Will compression drop the resolution below e-Tax requirements?

"Low" and "Standard" compression keep the resolution above 200 dpi and 256 gradations, meeting e-Tax's requirements. If you use "High" compression, open the result and verify that text is still legible.

Is it safe to use an online tool for tax documents?

sakutto's PDF compressor runs entirely in your browser. Your file is never uploaded to any server, so documents containing tax ID numbers (My Number) or income details stay private.

What if my PDF is still over 14 MB after compression?

Use a PDF splitter to break the file into smaller parts and submit them in multiple transmissions. e-Tax allows up to 11 submissions (154 MB total).

Can I compress a PDF of receipts photographed on my phone?

Yes. sakutto's PDF compressor works in any smartphone browser — no app installation needed.

Wrap-Up

Hit the e-Tax file size limit? PDF compression is the quickest fix. You can also prevent oversized files by optimizing your scan settings from the start. Since tax documents contain sensitive personal information, choose a tool that processes everything in your browser — with nothing uploaded to a server.