Add your PNG file
Drop one or more .png files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
PNG to PBM
Converting a .png image to .pbm re-encodes the pixels for a different balance of size, quality, and support. Free, private, and validated — the file never leaves your browser.
Private for supported formats — processed in your browser
Runs on your deviceConvert supported files
Drop PNG files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting PNG image to Portable bitmap
Converting a .png image to .pbm re-encodes the pixels for a different balance of size, quality, and support. A .png file is a losslessly compressed raster image with full 8-bit alpha transparency, making it the standard choice for graphics that must stay pixel-perfect. Screenshots, logos, UI assets, and diagrams are the classic .png territory, since sharp edges and flat color survive without compression artifacts.
A .pbm file is a Portable Bitmap: the simplest image format in common use, storing exactly one bit per pixel — black or white, with no grey and no colour. It carries a two-character magic number, the width and height, and then the pixels, and nothing else. For this route the practical draw is small enough to specify in a paragraph and to write from a shell script and uncompressed and lossless, so nothing is hidden between the header and the pixels — balanced against one bit per pixel — no grey, no colour, no transparency, which is worth knowing before you commit a large batch.
Why convert PNG to PBM?
The practical trigger for this conversion is usually a mismatch: with .png, photographic content produces files several times larger than JPEG or WebP. Switching to .pbm buys you small enough to specify in a paragraph and to write from a shell script, which is why it is the better fit for masks, stencils and other genuinely two-tone raster data. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
PNG vs PBM at a glance
| Aspect | PNG image (.png) | Portable bitmap (.pbm) |
|---|---|---|
| Format type | Lossless — every pixel or sample is preserved exactly | Lossless — every pixel or sample is preserved exactly |
| How it stores data | uses DEFLATE compression preceded by per-scanline prediction filters (None, Sub, Up, Average, Paeth) | two encodings share the extension: P1 stores pixels as ASCII 0 and 1 characters, P4 packs eight pixels into each byte |
| Strongest at | screenshots and screen recordings exported as stills | masks, stencils and other genuinely two-tone raster data |
| Weak spot | photographic content produces files several times larger than JPEG or WebP | one bit per pixel — no grey, no colour, no transparency |
| Metadata | text metadata lives in tEXt/iTXt chunks and XMP can be embedded there; standardized EXIF arrived late via the 2017 eXIf chunk, so many tools still drop EXIF when writing PNG | none beyond optional # comments in the header. There is no colour profile, no EXIF and no timestamp; a PBM carries dimensions and pixels and nothing else |
Pick PBM as the output
Select .pbm in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if PBM is selectable, the route is real and validated.
Convert on your device
Press Convert. Decoding and re-encoding happen on your device using the browser's native image pipeline and hand-tuned encoders.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid PBM file. Outputs keep the original filename with the .pbm extension.
PNG to PBM questions, answered
Will converting PNG to PBM lose quality?
Since png is lossless-oriented and pbm is lossless-oriented, the conversion preserves the source content exactly as stored; no additional compression pass is applied beyond what .pbm itself requires.
Is it private to convert PNG files here?
Yes — the .png file is processed inside your browser tab and never uploaded. Decoding and re-encoding happen on your device using the browser's native image pipeline and hand-tuned encoders. Close the tab and the file is gone from memory.
Where will the PBM file work?
Netpbm, ImageMagick, GIMP and most scientific imaging tools read PBM; browsers and consumer applications do not. Novus Convert decodes both the ASCII and the packed binary form locally and converts to PNG, JPEG, WebP and the other raster targets — which is usually the point, since PBM is a good interchange format and a poor delivery one.
Will the PBM file be bigger or smaller than my PNG?
It depends on the content: two encodings share the extension: P1 stores pixels as ASCII 0 and 1 characters, P4 packs eight pixels into each byte. Convert one representative file first and compare before batch-processing a large set.
What happens to the metadata in my PNG file?
In .png, text metadata lives in tEXt/iTXt chunks and XMP can be embedded there; standardized EXIF arrived late via the 2017 eXIf chunk, so many tools still drop EXIF when writing PNG. Re-encoding through the browser pipeline does not carry embedded metadata into the output, which doubles as a privacy scrub — check the exported file if you specifically need tags preserved.
Can I convert PBM back to PNG?
Yes — the reverse route exists as a separate tool. Bear in mind that round-tripping .png → .pbm → .png is not a perfect undo when any lossy step is involved; keep your original if fidelity matters.