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PBM File Format

Portable Bitmap category

PBM は白黒 2 値の portable bitmap です。1 ピクセル 1 ビットという最も単純な画像形式で、自作ツールでも扱えます。

Typical use: 2 値マスクを保つなら PBM、閲覧には PNG へ変換します。

About the PBM format

PBM は白黒 2 値の画像形式です。1 ピクセルを 1 ビットで表すという最も単純な構造です。

マスクや 2 値画像の処理に向きます。閲覧には PNG への変換が便利です。

Strengths

  • ✓ 構造が極めて単純
  • ✓ 容量が小さい
  • ✓ Zero patents, zero compression surprises

Limitations

  • ✗ 2 値しか表現できない
  • ✗ 一般的な用途には不向き
  • ✗ No alpha channel
Structure
P1 (ASCII) / P4 (binary) header + bits
Types / schema
1-bit black & white
Compatibility
netpbm, GIMP, ImageMagick
Best for
Print/fax pipelines, 1-bit art

Convert PBM to…

54 direct directions plus 15 workflows, sorted A–Z; 🔥 marks popular targets.

Convert other files to PBM…

Frequently asked questions

What is a PBM file?

PBM is the 1-bit member of the netpbm family: pure black and white, stored as readable ASCII or packed bits. It is the simplest image format that still counts as one — which is why half a century of tools can read it.

How do I convert PBM files online?

Pick a target format from the "Convert PBM to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.

Is it safe to convert PBM files here?

Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.

Which formats can PBM convert to?

This page lists all 69 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.