Job portals, visa applications, and university admissions share one annoying trait: hard file-size caps, often 1 MB. A 12 MB scan of your certificates simply bounces.
This guide shows how to hit an exact target size — not 'small-ish', but verifiably under the limit — using a free tool with a dedicated target-size mode.
Try it now: 🗜 Compress PDF · ✂ Split PDF · 📷 Images to PDF
Why presets fail portals (and what works)
Presets (Light/Medium/Heavy) shrink by fixed amounts — great for email, useless when a portal demands ≤1.00 MB. Target-size mode instead renders once at high resolution, then walks quality and scale down through up to ten attempts until the file fits. You get the exact number the portal wants.
When even target mode struggles
If the source is 50 pages of color scans and the cap is 1 MB, even the best engine must rasterize aggressively — text becomes unselectable images of text. Mitigate by splitting: keep only required pages (often the cap counts total size), then compress the slimmed file. Two steps, dramatically better readability.
Steps
- Upload the PDF to the compress tool
- Choose 'Target size' and enter the portal's limit (e.g. 1)
- Click Run and check the before/after sizes
- If it can't reach the target readably, split first, then retry
Pro tips
- Always keep the original — compression to tiny sizes is one-way.
- Need many certificates under caps? Batch mode compresses whole folders.
Frequently asked questions
How do I get a PDF under exactly 1 MB?
Use target-size mode and enter 1. The engine iterates quality and scale until the file fits, then reports the final size.
Will a 1 MB PDF still be readable?
For on-screen reading and printing at normal sizes, yes. Tiny subscript text may soften — preview before submitting.
Why do portals reject my PDF?
Usually a hard cap (1-2 MB) or dimension rule. Compress to the cap first; if it still fails, check the portal's page-size requirements.