Lump: Hex Viewer

January 26, 2026

Lump is an iOS app that lets you look inside almost¹ any file, showing the contents in hexadecimal. It can be useful to programmers, engineers, and software spelunkers.

Lump is an early release. It may gain some fancier features, either by popular request or if I need them. Lump is free, and I don’t intend to change that.

Launch Lump and open a file. You can also start it from a share sheet or a shortcut. You can drag and drop files into the window. On iPadOS, it supports multiple windows.

Text decoding. The right-hand column shows the data as 7-bit ASCII. From the [•••] menu choose Decode to switch to UTF-8. In that mode, some characters take two or three bytes. The initial bytes are shown as small dots.

The Go To button invokes a menu with three options: go to a specific location in the file, the beginning, or the end.

Find buttons Find bytes. Search for a series of bytes, from the menu or toolbar. Search starts from the top of screen or the last highlight. You can repeat the last search.

A few language translations are included, performed by AI. Let me know if you’d like to improve them or add other languages. The included languages are French, German, and Spanish.

FAQ

There are no frequently asked questions. Here are some we want to answer.

Why “Lump”?: We started with “Hex Dump”, then shorted it to “Hump”, realized that was a terrible name, and chose the next thing that came to mind.
Why do you keep saying “we”?: It sounded better at first. When we say it a few dozen times it sounds weird.

Probably. ↩︎