Best Free Image Converter & Compressor Tools Online (2026 Guide)
Pick your situation — jump to the tool.
"My form says max 50KB"
Exam photos, strict passport uploads, small profile thumbnails. Crop face and shoulders first; background pixels waste your budget.
Also relevant: Image Compressor to 20KB for signature-only fields.
"My form says max 100KB"
Job portals, college admission photos, KYC profile images. Prefer 100KB over 50KB when the form allows it — text and facial detail survive better.
"My form says max 200KB"
Document scans, clearer certificate photos, email attachments where 100KB is too tight.
PDF equivalent: PDF Compressor to 200KB.
"I don't know the exact KB limit"
Set your own target. Useful when the portal says "max 150KB" or "below 80KB" — sizes without dedicated pages.
PDF equivalent: Compress PDF.
"I need PNG → JPG (or the reverse)"
| Direction | Tool |
|---|---|
| PNG → JPG | PNG to JPG |
| JPG → PNG | JPG to PNG |
| WEBP → JPG | WEBP to JPG |
| JPG → WEBP | JPG to WEBP |
| PNG → WEBP | PNG to WEBP |
| WEBP → PNG | WEBP to PNG |
PNG screenshots converted to JPG before compression usually hit upload limits more easily.
"I have photos and need one PDF"
Image to PDF — accepts JPG, PNG, WEBP in one flow.
JPG to PDF — same job, JPG-focused entry point.
Compress images before conversion when the portal caps total PDF size. See JPG to PDF 50KB–100KB guide for size math.
"I need PDF pages as images"
| Output | Tool |
|---|---|
| JPG (smaller) | PDF to JPG |
| PNG (sharper text) | PDF to PNG |
Chain to a KB compressor after conversion if the image upload has a size cap.
"My PDF is too large"
| Portal limit | Tool |
|---|---|
| ~200KB | PDF Compressor to 200KB |
| ~500KB | PDF Compressor to 500KB |
| ~2MB | Compress PDF to 2MB |
| General | Compress PDF |
Scan-heavy PDFs: extract pages → compress images → rebuild PDF. Straight compression alone often fails on phone-photo scans.
"I need to combine or split PDFs"
PDF Merger — multiple PDFs → one file. Check page order before upload.
PDF Splitter — pull specific pages out before merging or uploading.
"I'm sending photos on WhatsApp"
Chat targets differ from form targets. Do not reuse WhatsApp-compressed files for SSC, UPSC, or PAN uploads.
"I need a passport-size photo under 50KB"
Passport Photo Size Compressor — crop in your gallery first; the tool handles KB reduction.
Full category index
Browse everything in File & Digital Tools — image converters, compressors, PDF utilities, and related document tools in one place.
How I pick a tool in one question
Is the upload asking for an image or a document?
- Image → compress to the stated KB, match format (JPG/PNG)
- Document (PDF) → convert images to PDF if needed, compress PDF to stated MB/KB
- Multiple files, one slot → merge PDFs or combine images → PDF first
Wrong category — image vs PDF — causes more rejections than wrong compression level.
Related reading on this blog
- Compress image to 50KB for exam forms — SSC, railway, state exams
- Compress PDF to 2MB for India uploads — certificate bundles
- Compress photos for WhatsApp — chat vs form distinction
Start with the portal's exact instruction line. Match KB, format, and dimensions before you optimize anything else.