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increasesize.in
100% Client-Side Processing • सुरक्षित व गोपनीय

Increase PNG size

PNG files are widely preferred for digital signatures, stamps, and transparent graphics due to their lossless compression. However, when transparent signatures compress down to 5 KB or 8 KB, portals frequently reject them for being too small. increasesize.in safely increases PNG file size by inserting valid private ancillary chunks (paDd) with correct CRC-32 checksums before the IEND marker, leaving your transparent background and vector-sharp strokes completely untouched.

🇮🇳 भारतीय उम्मीदवारों के लिए:अपनी फाइल चुनें, मनचाहा KB सेट करें और 'Increase Size' दबाएं। कोई भी फोटो सर्वर पर नहीं भेजी जाती।

Increase PNG size

Guaranteed valid file output • 100% private in browser memory (बिना किसी सर्वर अपलोड के सुरक्षित)

100% सुरक्षित • In-Browser
How this works (यह कैसे काम करता है): This tool adds harmless, valid data padding so your file reaches the exact minimum KB size required by official exam and banking portals. It does not alter your photo's pixel sharpness. (यह टूल फोटो की क्वालिटी बदले बिना उसका KB साइज बढ़ाता है ताकि सरकारी फॉर्म में 'File size too small' की समस्या न आए।) If you need larger physical dimensions or higher resolution, switch to Dimension / DPI mode below.
Drop your image or tap to browse from device
यहाँ अपनी फोटो या सिग्नेचर चुनें (JPG, PNG, WebP, PDF)
Supports JPG, PNG, WebP, and PDF (Max 25 MB). Paste with Ctrl+V.
100% private: stays in browser memory • फ़ोन में ही सुरक्षित
1 KB = 1024 Bytes
Quick Exam / Portal Presets
Processing Method

फाइल का साइज बढ़ाएं • डाउनलोड तुरंत शुरू होगा (Instant Client-Side Processing)

When you need to use this tool • आपको इस टूल की ज़रूरत कब होती है

  • Uploading transparent signatures that compress too small (under 10 KB or 20 KB)
  • Meeting portal requirements for PNG marksheets and certificate uploads
  • Maintaining sharp black-and-white signature contrast without JPEG artifacts
  • Ensuring PNG files pass automated upload validator size checks

How to use this tool in 3 simple steps • 3 आसान स्टेप्स में फोटो साइज बढ़ाएं

  1. 1
    Upload • अपलोड

    Upload your PNG

    Drop your PNG signature or graphic into the dropzone above.

  2. 2
    Target KB • साइज चुनें

    Set target size in KB

    Select your target (such as 20 KB or 50 KB) based on your portal guidelines.

  3. 3
    Download • डाउनलोड

    Download padded PNG

    Download the expanded PNG with full transparency and verified CRC32 chunks.

Transparency and lossless quality stay untouched

A PNG file consists of an 8-byte signature followed by a series of chunks. Every chunk consists of a 4-byte length, 4-byte chunk type code, payload data, and a 4-byte CRC-32 cyclic redundancy checksum. The PNG specification categorizes chunks by letter casing: a lowercase first letter denotes an ancillary chunk (ignorable by renderers), and a lowercase second letter denotes a private chunk. Our engine inserts a specialized paDd chunk immediately preceding the terminal IEND chunk. We compute the exact CRC-32 polynomial across the chunk type and padding payload. Standard image viewers display the PNG transparently without errors while the file size expands to your exact requirement.

Key Takeaway
The paDd chunk adheres to the official W3C PNG specification and preserves alpha transparency.

Common problems and verified fixes • आम गलतियाँ और उनके समाधान

Problem: Signature transparency turns into black background
Cause: Converting transparent PNG into JPG automatically fills transparent pixels with black.
Solution: Keep the file in PNG format and use our PNG padding tool to retain transparent backgrounds.
Problem: Portal throws "Corrupt PNG Checksum" error
Cause: Appending unformatted bytes at the end of a PNG file breaks parser chunk alignment.
Solution: Our tool calculates mathematically accurate CRC-32 checksums for every added chunk.
Problem: File size decreases after downloading on mobile
Cause: Some mobile photo galleries recompress images when saving to camera roll.
Solution: Save the file directly to your "Downloads" folder rather than the gallery photo stream.

Frequently asked questions

Yes. Safe metadata padding does not alter pixel color values or alpha channel transparency in any way. The alpha channel remains completely intact.

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