Remove Metadata from PNG Images Without Losing Quality
To remove metadata from PNG files without recompressing your artwork, you need to strip the non-critical container chunks (tEXt, zTXt, iTXt, and eXIf) while preserving the IDAT image stream. Our free browser tool strips embedded Stable Diffusion prompts, ComfyUI node workflows, camera parameters, and timestamps in seconds without re-encoding a single pixel.
Drag & drop photos or text files here
Remove hidden GPS locations, camera details, and AI prompts. Your pictures will keep 100% of their original visual quality and colors.
What would you like to remove?
A Quick Note On Image Privacy
This tool completely removes the hidden digital label attached to your file (like your camera model, where the photo was taken, and your AI prompt secrets).
Good to know: Removing hidden metadata does not alter the actual drawing or photo pixels. If an AI image has visual characteristics (like hands with extra fingers or AI texture patterns), those are part of the picture itself and cannot be removed without ruining the image. We protect your privacy while keeping your pictures crisp and untouched!
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How Our Tool Cleans METADATA FROM PNG
PNG files are structured as a linear sequence of 4-byte typed chunks. While pixel values live inside compressed IDAT chunks, metadata is stored in ancillary text chunks. Standard image converters convert PNGs onto an HTML5 canvas, which alters alpha channel transparency, drops color profiles, and modifies pixel values. 7minti uses a pure binary chunk parser that selectively bypasses ancillary metadata chunks, leaving the compressed IDAT stream 100% byte-identical.
How PNG Chunk Filtering Works Under the Hood
A standard PNG file starts with the 8-byte magic header (89 50 4E 47 0D 0A 1A 0A). Our engine scans each chunk header (4-byte length + 4-byte ASCII FourCC type):
- →tEXt & zTXt chunks: Latin-1 text pairs (such as 'parameters' written by AUTOMATIC1111) are discarded.
- →iTXt chunks: UTF-8 international text blocks containing complete ComfyUI JSON workflows or NovelAI tags are purged.
- →eXIf chunks: Raw TIFF-style EXIF blocks added in the 2017 PNG specification extensions are filtered out.
- →tIME chunks: 7-byte timestamp structures indicating last modification time are safely removed.
- →Critical chunks (IHDR, PLTE, IDAT, IEND) and color chunks (sRGB, iCCP) are preserved byte-for-byte.
❌ What Gets Cleaned (Deleted)
- •PNG tEXt chunks storing generator settings, author, and copyright notes
- •iTXt chunks holding Stable Diffusion prompts, negative prompts, and ComfyUI graphs
- •zTXt compressed metadata containing software tags and workflow history
- •eXIf chunk containing camera model, ISO, shutter speed, and focal length
- •tIME chunk recording file modification timestamp down to the second
- •C2PA provenance chunks (c2pa, caTX) recording creation credentials
✅ What Stays 100% Intact (Preserved)
- •IDAT chunks: 100% untouched Deflate-compressed image pixel bitstream
- •IHDR chunk: Image width, height, bit depth, and color type
- •tRNS & RGBA alpha channels: Transparent backgrounds remain perfectly intact
- •PLTE chunk: Indexed color palettes for graphic illustrations
- •iCCP & sRGB: Display color profiles so colors look identical on all screens
Most web tools load your PNG into a browser canvas and call toDataURL('image/png'). This forces a full decompress-and-recompress cycle, which destroys custom color profiles, alters transparent antialiasing, and bloats file size. Our binary chunk filter guarantees true zero-loss stripping.
How to remove metadata from PNG in 3 Simple Steps
No software installation required. Everything works inside your browser.
Select File
Drag and drop your file into the cleaner box above or browse your device.
Instant Cleaning
The binary cleaner purges hidden headers in milliseconds with zero quality loss.
Download
Click download to save your sanitized file, completely free of metadata tags.
Muhammad Ali(Founder & AI Systems Architect)LinkedIn Profile ↗
Security architecture reviewed by the founder of 7minti Platform
The 7minti remove metadata from PNG Tool and technical documentation comply with international cryptographic and file container standards for remove metadata from PNG Architecture & Standards. All binary parsing logic executes strictly on the client machine via the native JavaScript TypedArray API, ensuring zero data leakage to external networks.
Verified Technical Standards
- JPEG Stream Parsing:ISO/IEC 10918-1
- PNG Chunk Architecture:ISO/IEC 15948:2004
- Camera EXIF Standard:JEITA CP-3451E (Exif 2.32)
- Provenance Manifests:C2PA Standard v1.3 and v2.0
- Client Memory Isolation:ECMAScript TypedArrays
Tested Real-World Environments:
Frequently Asked Questions
Unique answers specifically for metadata from PNG.
How do I remove Stable Diffusion prompts from a PNG?
Drop your PNG into the cleaner above. Stable Diffusion saves prompts in the 'parameters' tEXt chunk. 7minti detects and deletes this chunk, removing your prompt and seed while leaving your art untouched.
Does removing PNG metadata delete transparent backgrounds?
No. Transparency is stored in the critical IHDR and IDAT chunks (or tRNS for palette images). We only filter text and EXIF chunks, so your transparent cutouts remain 100% crisp.
Can someone steal my ComfyUI workflow from an uploaded PNG?
Yes. Raw ComfyUI PNGs save your full node graph, including custom checkpoint names and workflow logic, in an iTXt chunk. Anyone who drops your PNG into ComfyUI can view your entire setup unless you clean it first.
What is the eXIf chunk in PNG files?
Historically, PNG did not support EXIF. In 2017, the eXIf chunk was standardized to store camera metadata and GPS coordinates directly in PNGs. Our tool detects and removes this chunk.
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