Few things are more frustrating than reaching the last step of an online application and being told "file size must be between 20 KB and 50 KB" or "invalid file format". Recruitment portals, entrance-exam systems, scholarship sites and banks all ask for photos, signatures and scanned documents, each with their own rules. This handbook gives you a repeatable method, so you can prepare everything once and reuse it for each application.
Step 0: read the instructions
Every portal states requirements somewhere: dimensions, file type, size range and sometimes background colour or recency of the photo. Write them down before you start. Rules differ between organisations and change between notifications, so never assume. A typical set looks like this (always confirm against your own notice):
- Photograph: JPG, roughly 20 to 100 KB, recent, plain light background, face clearly visible.
- Signature: JPG, roughly 10 to 50 KB, signed with a dark pen on white paper.
- Identity and education documents: JPG or PDF, often 100 KB to 1 MB per file.
Step 1: take a good original
A sharp, well-lit original makes every later step easier. Stand facing a window or lamp, with a plain light wall behind you. Hold the phone at eye level, use the rear camera if possible and take several shots. Do not use filters or beauty modes: portals and verifiers reject edited faces. For the signature, use a dark pen on plain white paper, photograph it flat and crop tightly. For documents, place them on a flat surface in even light or use a scanning mode.
Step 2: crop and resize
Crop to the area that matters: head and shoulders for a photograph, only the signature for the signature. Many portals also specify dimensions in pixels, for example around 200 x 230 for a photo or a wide, short rectangle for a signature. Resize to those numbers with your phone's editor or any image tool. Fewer pixels is the largest single saving on file size.
Step 3: choose the format
JPG is requested most often. iPhone photos are HEIC and must be converted; the HEIC to JPG converter does it in a click. Screenshots and scans saved as PNG are large and often rejected, so convert them to JPG too. If a document must be a PDF, turn your images into a PDF with Image to PDF.
Step 4: reduce the size
Use the File Size Reducer: add your picture, move the slider and watch the live size estimate until it sits just below the maximum. Aim about 10 percent under the limit. A 50 KB maximum is safer with a 44 to 47 KB file, because systems measure kilobytes in slightly different ways.
Step 5: check before uploading
- Right-click (or long-press) the file and read the size in KB.
- Open the image at full size. Are the face and signature clearly readable?
- Does the file name contain only letters, numbers and simple characters? Name it photo.jpg, signature.jpg or aadhaar_front.jpg rather than "IMG 20261013 final (2).jpg".
- Is the extension exactly what is requested: .jpg versus .jpeg versus .pdf?
Documents and multi-page scans
Certificates and ID proofs are often requested as a single PDF per document. Scan or photograph each page, reduce each image, then combine them in order with Image to PDF; choose A4 and one image per page. If a portal wants one combined PDF for several documents, merge finished PDFs with the PDF Merger. To keep the size down, scan text documents in black and white or grey at about 150 to 200 dpi rather than colour at 600.
The most common rejection reasons
- The file is a few kilobytes over the limit.
- Wrong format: HEIC, PNG or WebP instead of JPG.
- Dimensions do not match the requirement.
- The photograph has a dark or patterned background, a cap, glasses with glare or shadows across the face.
- The signature is on lined paper, in blue ink on a coloured page or cropped too tightly.
- The scan is blurred, rotated or cut off.
- Names with spaces, brackets or non-Latin characters that the portal cannot handle.
Time management
Application windows often close at midnight and the servers are slowest in the final hours. Prepare your photo, signature and documents a few days early, keep them in a folder, and upload on a stable connection. Keep a copy of the confirmation page or receipt you receive.
Protecting your documents
Identity documents are sensitive. Upload them only to the official portal you intended, avoid public computers, and delete temporary copies afterwards. When you use an online tool to prepare them, choose one that does not store files. TinyFileHub returns your processed file and keeps nothing, and we are an independent tool, not connected to any exam body, recruiter, bank or government website.
Prepare once, name the files well, check each against the requirements, and keep them for next time. With that routine, uploading becomes a five-minute task instead of a last-minute scramble.
Quick reference checklist
| Item | Prepare | Check |
|---|---|---|
| Photograph | Plain light background, face centred, no filters | JPG, within the KB range, exact dimensions |
| Signature | Dark pen on white paper, tight crop | JPG, legible, within the KB range |
| ID proof | Flat, even light, all four corners visible | JPG or PDF, readable text |
| Certificates | Scan in grey, 150 - 200 dpi | One file per document, pages in order |
| File names | Letters, digits, no spaces | Correct extension |
If the portal still rejects the file
Try a different browser, disable extensions that may interfere with uploads, and use a wired or stable connection. Some portals only accept the exact extension .jpg and not .jpeg; renaming the extension of a genuine JPG file is safe in that case. If an error message mentions dimensions, recheck the pixel size with the image's properties rather than guessing.