Why do exam portals reject a PNG file renamed to .jpg?

Renaming a file only changes the filename text string. It does not alter the underlying binary encoding. When portal servers inspect the initial bytes (magic numbers), they detect PNG data instead of JPEG, flagging the file as invalid or corrupted.

How does this tool repair the file?

The tool decodes the actual image pixels using in-browser image decoders, fills transparent regions with pure white background, and encodes genuine JPEG binary chunks with authentic SOI and JFIF headers.

Will the image quality degrade during conversion?

No. The conversion uses high quality canvas rendering with 92% JPEG quantization, preserving facial details, clarity, and sharpness.

Does this also fix WebP and HEIC files renamed as JPG?

Yes. Any modern image container that was improperly renamed with a .jpg extension will be correctly decoded and re-encoded into compliant JPEG format.

DESK // TOOL WORKSPACE · LOCAL ENGINE

CLIENT-SIDE BUFFER (0% CLOUD STORAGE)

Fix PNG Renamed as JPG for Exam Portals

Fix PNG renamed as JPG repairs files where the extension was manually changed without converting binary headers. Government exam portals detect this signature mismatch and reject the upload. This tool reads true binary magic bytes, decodes the original pixels, and re-encodes a genuine baseline JPEG with standard JFIF headers.

STEP 01

INTAKE / UPLOAD

STEP 02

ADJUST / PREVIEW

STEP 03

EXPORT / DOWNLOAD

INTAKE // DROP FILE ON DESK

Upload image with format error

Detects files with mismatched extensions (e.g. PNG renamed to JPG) and reconstructs true JPEG binary structure.

LOCAL BUFFER/0% SERVER TRANSMISSION

OFFICIAL BENCHMARK

Binary File Header Standards

Source: W3C and Joint Photographic Experts Group (Verified October 2026)

Item Requirement	Required Value
Valid JPEG Signature	Bytes 0xFF 0xD8 followed by JFIF or Exif marker
PNG Signature	Bytes 0x89 0x50 0x4E 0x47 (rejected if renamed to .jpg)
WebP Signature	Bytes 0x52 0x49 0x46 0x46 (RIFF container)
Output Format	Authentic Baseline JPEG with JFIF 1.2 marker

VERIFIED ANSWERS