JPG to PDF under 100 KB
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Make a PDF below 100 KB from one or two document photos, ready for size-limited uploads.
A 100 KB PDF is the most common limit for a single uploaded document: an identity card, a caste or income certificate, a mark sheet, a birth certificate. A phone photo is 20–50 times bigger than that. This page converts JPG, PNG or HEIC photos into a PDF and compresses the page images just enough to land under 100 KB, keeping as much quality as the limit allows. It works in your browser, so certificates and ID copies never pass through anyone’s server.
How to compress an image to 100 KB
- Add the document photo (or both sides of a card, in order).
- Keep A4 as the page size for forms, set margin to 0, and rotate a page if it is sideways.
- Convert and read the result line: it shows the final size in bytes and the JPEG quality reached; open the PDF to check it, then download.
What happens to quality, size and metadata
The converter works out one byte budget for the whole PDF (100,000 bytes minus a small safety margin and the PDF’s own structure) and searches for the highest JPEG quality at which all page images fit. Every page gets the same quality and scale, so none looks worse than another. If the lowest quality still doesn’t fit, all images are scaled down a step and the search repeats. The PDF is then built and measured; if it is still over, the budget shrinks and it tries again. One or two clear pages typically keep fine detail at 100 KB. GPS and camera metadata are stripped.
Where 100 KB is asked for
In India, 100 KB is a standard ceiling on many online application forms: state and central recruitment portals for certificates and ID proofs, university and college admission forms for mark sheets and transfer certificates, scholarship portals for income and caste certificates, and bank or insurance KYC uploads for address proof. Some passport, visa and public-service portals in other countries use similar small limits for supporting documents. The requirement is usually written as “PDF, maximum 100 KB” beside the upload field. Some forms also want a minimum (often 20 KB) and a specific resolution; read the notice before you prepare files.
Tips for clear photos at small sizes
- Flatten the paper and photograph it from straight above, filling the frame; tilted pages waste bytes on background and look smaller.
- Avoid flash glare on laminated cards; shoot near a window instead.
- For a two-sided ID, put front and back as two pages in one PDF rather than one big photo of both sides on a table.
JPG vs PDF
| Full name | JPG | |
|---|---|---|
| Full name | JPEG (Joint Photographic Experts Group) | Portable Document Format |
| Introduced | 1992 | 1993 |
| Defined by | JPEG (ITU-T & ISO/IEC) · ITU-T T.81 / ISO/IEC 10918-1 | ISO · ISO 32000 |
| Compression | Lossy | Lossy or lossless |
| Transparency | No | Yes |
| Animation | No | — |
| Largest size | 65,535 × 65,535 px | 14,400 × 14,400 pt (200 × 200 in) per page |
| Chrome / Edge | Yes | Yes |
| Safari | Yes | Yes |
| Firefox | Yes | Yes |
| Windows | Yes | — |
| iPhone / iPad | Yes | — |
| Android | Yes | — |
| Typical use | Photos for sharing, email, online forms and printing, where it has to open everywhere. | Documents for sending, printing and uploading: forms, scans, invoices, applications. |
JPG JPG is the lossy photo format standardised in 1992 as ITU-T T.81. It throws away detail the eye barely notices, and the quality setting decides how much. It has no transparency and no animation, but every phone, computer, browser, printer and upload form opens it.
PDF PDF is a page-based document format created in 1993 and an open ISO standard (ISO 32000) since 2008. Each page keeps its exact layout, fonts and images, so it looks the same on every device. A PDF can hold scanned photos, text, vector drawings and forms.
Sources for this table
- www.itu.int/rec/T-REC-T.81
- www.w3.org/Graphics/JPEG/itu-t81.pdf
- developer.mozilla.org/en-US/docs/Web/Media/Guides/Formats/Image_types
- developer.android.com/media/platform/supported-formats
- www.iso.org/standard/51502.html
- www.iso.org/standard/75839.html
- www.rfc-editor.org/rfc/rfc8118
- www.loc.gov/preservation/digital/formats/fdd/fdd000474.shtml
Browser support data: caniuse.com, CC BY 4.0.
Without this site
There is no exact-size option built into Windows, macOS, iOS or Android. You can lower size indirectly: on a Mac, Preview’s File › Export with the Quartz filter “Reduce File Size”; on an iPhone, take a screenshot of the photo and convert the screenshot, which is smaller than the original. Neither lets you aim for 100 KB, so you end up guessing and re-trying, which is what this page automates.
Troubleshooting
- Two sides of a card in one photo. The background between them eats the budget. Photograph front and back separately and add them as two pages.
- The PDF looks soft. Crop away the table and borders before converting, so the 100 KB goes to the document itself.
- The portal rejects the file name. Rename the PDF to letters, numbers and dashes only; some forms refuse spaces or brackets.
Questions and answers
How do I make a PDF under 100 KB from a photo?
Add the photo here (JPG, PNG or HEIC from an iPhone) and press Convert. The converter compresses the image inside the PDF until the file is below 100,000 bytes and tells you the result. If the page is readable when you zoom in, it is ready to upload.
Can I put several JPGs into one PDF under 100 KB?
Yes, as long as the pages can stay readable. Two or three document pages usually fit; ten photos usually don’t. All pages share the 100 KB budget equally. If it is impossible, you are told the smallest size we could reach so you can choose a larger limit or fewer pages.
How do I reduce a PDF to 100 KB if I already have the PDF?
This page builds a new PDF from images. If you already have a scanned PDF, convert its pages to images with PDF to JPG at 150 DPI, then add those JPGs here. The result is a fresh PDF under 100 KB. (Text PDFs exported from Word are usually already small.)
Will the form accept the PDF if it shows 98 KB on my phone?
It should. We keep the file at or under 100,000 bytes. Phones and Windows show sizes in units of 1024 bytes, so that file appears as at most about 97.7 KB there, and forms that count in 1000- or 1024-byte units both see it as under 100 KB.