How do I reduce a certificate PDF to 100 KB for a government form?

Open the compress to 100 KB page. The compressor there is already set to 97 KB, which passes a 100 KB limit however the portal counts. If it can’t get that small and stay readable, crop the document tighter or rescan it in better light.

Should I upload a masked Aadhaar?

Only if the organisation accepts it. A masked Aadhaar shows only the last four digits of the number. If the form needs the full number, upload the full copy.

Why does the portal say my 100 KB file is too large?

Usually because it counts 1 KB as 1,000 bytes and your file is slightly over 100,000 bytes. Compress to 97 KB to stay under the limit either way.

Are my documents uploaded to mypdf.space?

No. Scanning, converting, compressing and redacting all run in your browser. The files stay on your device.

How to prepare PDFs for a government form upload

By SumitPublished 12 Oct 20265 min readWorkflows

Short answer

Read the limit and file type next to each upload field, because they often differ on the same form. Make one PDF per document, either by scanning with Scan to PDF or by converting photos with Images to PDF. Then compress each file to its limit; the compress to 100 KB and 200 KB pages open the compressor already set just under the limit. Open every file before submitting to check it’s readable, and keep the originals.

Government application portals tend to fail in the same few ways: a file that’s 104 KB when the limit is 100, a certificate photographed on a dark table that won’t compress, or a PDF that opens with a password prompt and gets rejected.

This guide walks through preparing each document so it passes first time. Everything here runs in your browser, which matters when the documents are your ID, your income certificate and your address proof.

Read the field, not the page

A single form can ask for a photo in JPG under 50 KB, a signature in JPG under 20 KB, and certificates in PDF under 200 KB. The instructions at the top of the page are often more general than the limits next to each field. The field wins.

Also check the file type. If a field asks for JPG or JPEG, it wants an image, not a PDF, and mypdf’s tools won’t help with that one. Use your phone’s photo editor or the image specs given on the form.

Preparing your documents, step by step

1
List every upload field on the form with its file type and size limit. Write them down before you start converting anything.
2
Photograph or scan each document on its own: flat, well lit, against a light surface, filling the frame. One document per file unless the form says otherwise.
3
Turn the photos into PDFs with Scan to PDF or Images to PDF. For a two-sided document, put both sides in the same PDF.
4
If a PDF has extra pages the field doesn’t need, remove them with Delete pages.
5
Compress each file to its field’s limit using the matching page: 50 KB, 100 KB, 200 KB, 300 KB or 500 KB.
6
Open every finished file. Zoom in on names, dates and numbers. If anything is blurry, rescan rather than compress harder.
7
Rename the files plainly (for example, income-certificate.pdf) and upload them field by field.

From phone photo to a clean PDF

Most size problems start with the photo. A shadowy picture of a certificate on a patterned tablecloth contains a lot of detail the compressor has to keep, so it compresses badly.

Light: daylight from a window, no flash. Flash makes a glare patch right over the text.
Background: put the document on a plain, light surface.
Framing: fill the frame with the document and hold the phone parallel to it. Crop off the edges afterwards with Crop pages if needed.
Resolution: you don’t need your phone’s maximum. A document that ends up at 100 KB gains nothing from a 12-megapixel photo.

Hitting the size limit exactly

Some portals count 1 KB as 1,000 bytes and others as 1,024. A file your computer shows as “100 KB” can be 102,400 bytes and get rejected by a strict portal. The compress-to-size pages avoid this by setting the target slightly under the limit, for example 97 KB for a 100 KB field.

The compressor tries a lossless rebuild first and only lowers the resolution if it has to. If a file can’t reach the limit and stay readable, it tells you so instead of handing you a blurry mess. At that point, rescanning with better light or cropping tighter is the fix.

Open Compress PDF

Aadhaar, PAN and what you can hide

UIDAI offers a masked Aadhaar: a version where the first eight digits of the number are replaced with “xxxx-xxxx” and only the last four are visible (UIDAI). Where an organisation accepts it, the masked version is the safer one to upload, and you can download it from UIDAI rather than editing your own copy.

Don’t mask or redact anything a form explicitly asks for. If the field is “Aadhaar card (front and back)”, the office may need the full number, and a masked copy can get the application returned.

If you’re sharing a copy where hiding the number is fine, Redact lets you draw a box over just the first eight digits. Auto-redact PII can find Aadhaar-style and PAN-style numbers automatically, but it blacks out the whole number, not just part of it.

Before you press submit

A one-minute check saves a rejected application:

Does it open without a password? Portals usually reject protected PDFs. Use Unlock PDF with the password you already have.
Is it the right document in the right field? Easy to swap when the files are all called scan001.pdf.
Is it readable at 100% zoom? Names, dates and seals especially.
Is anything in it you didn’t mean to send? Old drafts can carry hidden text or an author name. Check the PDF for hidden data first if you’re unsure.

Limits worth knowing

mypdf works with PDFs. Photo and signature fields that ask for JPG images need an image editor instead.
Every portal sets its own limits and rules, and they change. Always follow the instructions on the form.
Compression can’t rescue a blurry or badly lit photo. Rescanning is often the faster fix.
Auto-redact blacks out whole numbers it detects. For partial masking, draw boxes by hand with Redact.
Password-protected PDFs have to be unlocked before they can be compressed.

Tools used in this guide

Frequently asked questions

How do I reduce a certificate PDF to 100 KB for a government form?
Open the compress to 100 KB page. The compressor there is already set to 97 KB, which passes a 100 KB limit however the portal counts. If it can’t get that small and stay readable, crop the document tighter or rescan it in better light.
Should I upload a masked Aadhaar?
Only if the organisation accepts it. A masked Aadhaar shows only the last four digits of the number. If the form needs the full number, upload the full copy.
Why does the portal say my 100 KB file is too large?
Usually because it counts 1 KB as 1,000 bytes and your file is slightly over 100,000 bytes. Compress to 97 KB to stay under the limit either way.
Are my documents uploaded to mypdf.space?
No. Scanning, converting, compressing and redacting all run in your browser. The files stay on your device.

Sources

Unique Identification Authority of India (UIDAI), What is Masked Aadhaar?