bytecode-viewer

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1. v2.13.2 Jan 1, 2026 · release notes

   Bytecode Viewer v2.13.2 adds native macOS menubar, Russian translation, and Java 25 LTS support.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v2.13.2 https://github.com/Konloch/bytecode-viewer.git
   # already have the repo? check out this version:
   $ git checkout v2.13.2

   • Adds native macOS menubar integration for a more platform-consistent UI experience.
   • Adds Russian language translation to the UI.
   • Supports Java 25 LTS in the build, enabling analysis of Java 25-compiled bytecode.
   • Updates ASMASMAttack Surface Management: the continuous practice of discovering, inventorying, and monitoring an organization's externally exposed assets so that cyber tools can flag unknown or misconfigured entry points before attackers find them. library to version 9.9, expanding bytecode parsing support.

   4 details in Everything

   └──▷ BREAKING ON UPGRADE

   • !The built-in obfuscator has been removed; workflows relying on it must use an alternative tool.
2. v2.13.1 Apr 17, 2025 · release notes

   Bytecode Viewer v2.13.1 adds resource reload confirmation toggle and removes java/javax package filtering

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v2.13.1 https://github.com/Konloch/bytecode-viewer.git
   # already have the repo? check out this version:
   $ git checkout v2.13.1

   • Adds option to disable the Resource Reload Confirmation dialog for faster iterative analysis workflows.
   • Removes the filter that blocked inspection of classes in packages starting with java, javax, and similar prefixes, enabling analysis of JDK-internal and bootstrap classes.
   • Runs apktool on multiple threads when decoding APK resources, speeding up Android reverse-engineering workflows.
   • Skips jar compression and decompression when decoding resources and when using Dex2Jar, reducing I/O overhead for large APKs.

   4 details in Everything

3. v2.13.0 Dec 31, 2024 · release notes

   Bytecode Viewer v2.13.0 adds jump-to-declaration, bytecode token highlighting, and middle-click tab close.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v2.13.0 https://github.com/Konloch/bytecode-viewer.git
   # already have the repo? check out this version:
   $ git checkout v2.13.0

   • Adds Jump to Declaration navigation, letting analysts quickly trace references to their source definitions.
   • New bytecode token highlighter improves readability by syntax-coloring tokens in bytecode view panes.
   • Middle-click to close tabs for faster multi-class workflow navigation.
   • Improved plugin writing support for scripting and extending analysis workflows.

   4 details in Everything

   └──▷ BREAKING ON UPGRADE

   • !The CLI is non-functional in v2.13.0 due to an in-progress rewrite; users relying on CLI must stay on v2.12.
4. v2.12 Dec 18, 2023 · release notes

   Bytecode-viewer v2.12 adds ASMifier support, looping non-exact search, and dark theme default.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v2.12 https://github.com/Konloch/bytecode-viewer.git
   # already have the repo? check out this version:
   $ git checkout v2.12

   └──▷ USE IT
   Generate ASMASMAttack Surface Management: the continuous practice of discovering, inventorying, and monitoring an organization's externally exposed assets so that cyber tools can flag unknown or misconfigured entry points before attackers find them. bytecode instructions for a class file using the new ASMifier engine.
   shell copy

   java -jar bytecode-viewer.jar -d ASMifier -f target.class

   • Adds ASMifier support for generating bytecode instructions during decompilation
   • Adds Looping Search functionality for Non-Exact matches across the file

   2 details in Everything

   └──▷ BREAKING ON UPGRADE

   • !The -decompiler-list CLI flag is renamed to -list
5. v2.11.2 Apr 11, 2022 · release notes

   Adds Java 18 and 19 support via ASMASMAttack Surface Management: the continuous practice of discovering, inventorying, and monitoring an organization's externally exposed assets so that cyber tools can flag unknown or misconfigured entry points before attackers find them. and Security Manager updates

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v2.11.2 https://github.com/Konloch/bytecode-viewer.git
   # already have the repo? check out this version:
   $ git checkout v2.11.2

   • Adds Java 18 and Java 19 support for decompilation
   • Adds Croatian, Czech, Bulgarian, Danish, and Serbian UI translations

   2 details in Everything

6. advisory CVE-2022-21675 Jan 11, 2022 · issue 128
   • CVE-2022-21675: Bytecode Viewer v2.10.x Zip Slip (CVSSCVSSCommon Vulnerability Scoring System, a method for describing a vulnerability's characteristics and severity. Its score is not the probability that attackers will exploit it. 7.8, affects v2.10.16)⁠︀︄︇︀︅︉︀︅︀︀︃︀︀︅︅︀︅︊︀︄︆︀︃︄⁠
7. v2.10.16 Aug 19, 2021 · release notes

   v2.10.16 adds tabbed windows, redesigned plugin console for multi-resource workspaces, and right-click context menus.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v2.10.16 https://github.com/Konloch/bytecode-viewer.git
   # already have the repo? check out this version:
   $ git checkout v2.10.16

   └──▷ HOW TO FIND IT
   Organize multiple open classes or archives in a single window instead of having separate top-level windows.
   📍Open multiple files; notice the tab bar at the top of the main window allowing you to switch between them.
   Access quick-open and other commands directly from the resource list without using the main menu.
   📍Right-click any item in the resource list to reveal context menu options like quick-open.
   • Tabs have been introduced for windows that were previously individual panes
   • The plugin console has been redesigned to support multiple resources in a single workspace
   • Right-click context menus on the resource list, including quick-open and other useful commands

   3 details in Everything

8. v2.10.15 Jul 23, 2021 · release notes

   v2.10.15 adds GraalJS engine support, WebP asset viewing, and improved Hex-Viewer dark mode

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v2.10.15 https://github.com/Konloch/bytecode-viewer.git
   # already have the repo? check out this version:
   $ git checkout v2.10.15

   • Adds limited GraalJS support for executing JavaScript within the tool (requires external Graal.JS dependencies)
   • Adds WebP image format support for viewing assets in the GUIGUIA graphical user interface, controls such as windows, buttons and menus. It lets people use software visually rather than entering commands.
   • Improves Hex-Viewer rendering for Dark Mode themes
   • Improves zoom functionality across the application interface

   4 details in Everything

9. v2.10.14 Jul 20, 2021 · release notes

   v2.10.14 adds javap disassembler, automatic python path detection, and dynamic width hex-viewer

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v2.10.14 https://github.com/Konloch/bytecode-viewer.git
   # already have the repo? check out this version:
   $ git checkout v2.10.14

   └──▷ HOW TO FIND IT
   Inspect Java bytecode using the new javap backend instead of the previous disassembler.
   📍Open a .class file; the Hex-Viewer will now utilize the javap disassembler by default.
   Resolve Python dependencies without manually setting environment variables or config paths.
   📍Launch bytecode-viewer; automatic python path detection will locate the interpreter.
   • Adds javap disassembler support for viewing Java bytecode instructions directly within the tool.
   • Adds automatic Python path detection to resolve interpreter locations without manual configuration.
   • Adds dynamic width capability to the Hex-Viewer, allowing it to resize based on window dimensions.

   3 details in Everything

10. v2.10.13 Jul 9, 2021 · release notes

    Adds Plugin Writer to create and edit external plugins from within BCV

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.10.13 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.10.13

    └──▷ HOW TO FIND IT
    Develop a new plugin without leaving the GUIGUIA graphical user interface, controls such as windows, buttons and menus. It lets people use software visually rather than entering commands. to test changes immediately.
    📍In the bytecode-viewer GUI, open the Plugin Writer tool to create and edit your external plugins.
11. v2.10.12 Jun 29, 2021 · release notes

    Adds dark mode, XAPK support, JS plugins, and translation process to bytecode-viewer

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.10.12 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.10.12

    • Introduces opt-in Dark mode and theme selection for the GUIGUIA graphical user interface, controls such as windows, buttons and menus. It lets people use software visually rather than entering commands..
    • Enables viewing of XAPK files directly in the tool.
    • Supports loading JavaScript-based plugins to extend functionality.

    3 details in Everything

12. v2.10.10 Jun 21, 2021 · release notes

    Adds ASMTexifier view pane and improved search regex support in bytecode-viewer v2.10.10

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.10.10 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.10.10

    • Introduces ASMTexifier view pane for enhanced bytecode visualization
    • Improves search regex engine for better pattern matching across classes
    • Adds UTF-8 character support in the viewer interface

    3 details in Everything

13. v2.9.22 Jun 14, 2019 · release notes

    Bytecode Viewer v2.9.22 adds automatic standard format and minor version correction for pre-Java 1 classes via ASMASMAttack Surface Management: the continuous practice of discovering, inventorying, and monitoring an organization's externally exposed assets so that cyber tools can flag unknown or misconfigured entry points before attackers find them. Classwriter

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.9.22 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.9.22

    • ASM Classwriter now automatically updates all pre-Java 1 classes to proper standard class format
    • ASM Classwriter sets the classes minor version from <= 2 to 3

    2 details in Everything

14. v2.9.20 Jun 1, 2019 · release notes

    Bytecode Viewer v2.9.20 adds automatic RT.jar generation for JDK 9+ and restores smali disassembly.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.9.20 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.9.20

    • Adds automatic RT.jar generation for JDK 9+ runtimes to enable proper decompilation of modern Java libraries

    1 detail in Everything

15. v2.9.18 Apr 25, 2019 · release notes

    Adds WAR and JSP file loading and integrates the JADX decompiler in bytecode-viewer v2.9.18.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.9.18 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.9.18

    • Adds WAR and JSP file loading capabilities
    • Adds integration with JADX Decompiler for Java bytecode decompilation

    2 details in Everything

16. v2.9.13 Apr 13, 2019 · release notes

    Adds automatic detection of rt.jar to streamline classpath resolution

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.9.13 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.9.13

    • Added autofinding of RT.jar

    1 detail in Everything

17. v2.9.4 Apr 28, 2015 · release notes

    Adds Krakatau optional library support and new keyboard shortcuts for run, save, and compile

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.9.4 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.9.4

    • Introduces Krakatau as an optional decompiler/disassembler/assembler component via -O and -skip flags (passed to Krakatau)
    • Adds Ctrl+R shortcut to execute/run files directly from the editor
    • Adds Ctrl+S shortcut to save files as in the UI
    • Adds Ctrl+T shortcut to compile selected content
    • Reworks View Panes into a simplified View menu/section

    5 details in Everything

18. v2.8.0 Feb 4, 2015 · release notes

    Bytecode-Viewer v2.8.0 adds Krakatau disassembly and assembly capabilities.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.8.0 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.8.0

    └──▷ HOW TO FIND IT
    Use the Krakatau engine to view Java class bytecode assembly directly in the GUIGUIA graphical user interface, controls such as windows, buttons and menus. It lets people use software visually rather than entering commands..
    📍In the viewer's decompiler dropdown, select Krakatau and choose Assembly from the action menu.
    Decompile a Java class file using the newly integrated Krakatau decompiler.
    📍Open a .class file and ensure Krakatau is selected as the active decompiler to view the source-like output.
    • Adds Krakatau as a Java decompiler option
    • Adds Krakatau Disassembly support for generating bytecodes
    • Adds Krakatau Assembly support for generating bytecodes

    3 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Dropped JRuby and Jython support, reducing install size to ~16mb from ~45mb.
19. v2.7.0 Jan 27, 2015 · release notes

    Bytecode Viewer v2.7.0 introduces enhanced security controls by blocking exec calls and port binding, alongside UI and default compile improvements.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.7.0 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.7.0

    • Sets the improved Refresh Class function as the default compile action
    • Adds new keyboard shortcuts: CTRL + O to open the add file interface and CTRL + N for the net workspace

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !BCV now blocks exec calls and prevents port binding, which may break workflows relying on these operations within the viewer.
20. v2.5.0 Jan 6, 2015 · release notes

    v2.5.0 adds APK support via ASMASMAttack Surface Management: the continuous practice of discovering, inventorying, and monitoring an organization's externally exposed assets so that cyber tools can flag unknown or misconfigured entry points before attackers find them. downgrade and allows saving/exporting to DEX format with .dex import capability.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.5.0 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.5.0

    • ADDED APK SUPPORT, had to downgrade to ASM 3.3
    • Added save as DEX and import .dex files

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Downgrading to ASM 3.3 means losing some annotation debugging for the Bytecode Decompiler.
21. v2.4.0 Dec 21, 2014 · release notes

    Bytecode Viewer v2.4.0 adds a new outdated pane, package expand/collapse in file navigator, and threaded singular class decompilation save.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.4.0 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.4.0

    └──▷ HOW TO FIND IT
    Use the new Outdated pane to quickly identify deprecated API usage in compiled classes.
    📍In Bytecode Viewer, look for the Outdated tab in the bottom pane to view results.
    Manually organize large projects by collapsing unused package trees in the file navigator.
    📍Click the arrow icons next to package names in the File Navigator panel to expand or collapse them.
    • Added a new Outdated pane to display deprecated or obsolete bytecode constructs
    • Added ability to expand and collapse packages directly within the file navigator tree
    • Added threaded processing for saving Java files from singular class file decompilation

    3 details in Everything

22. v2.2.0 Dec 14, 2014 · release notes

    Bytecode-viewer v2.2.0 adds method descriptions in decompiler comments and makes search results clickable.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.2.0 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.2.0

    └──▷ HOW TO FIND IT
    Instantly jump to the source of a matched method in the decompiler window after searching.
    📍In the search bar, enter getVersion and click any result in the list below the search input.
    • bytecode-decompiler now includes the method's description inside a generated comment block in the decompiled output
    • Search results within the text search function are now clickable for direct navigation

    2 details in Everything

23. v2.0 Nov 6, 2014 · release notes

    bytecode-viewer v2.0 adds a GUIGUIA graphical user interface, controls such as windows, buttons and menus. It lets people use software visually rather than entering commands. for exception stack traces and an improved Malicious Code Scanner.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v2.0 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout v2.0

    • Adds a GUI display for all Exception Stack Traces
    • Improves the Malicious Code Scanner to be instant

    2 details in Everything

24. b1.5.3 Nov 4, 2014 · release notes

    Adds toggle to outdated status and globalizes settings/temp files in bytecode-viewer b1.5.3.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch b1.5.3 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout b1.5.3

    └──▷ HOW TO FIND IT
    View the application version and directory path via the UI without checking the CLI.
    📍Open the About window from the Help menu
    Toggle an entry to outdated status within the viewer interface.
    📍Use the toggle to outdated status option in the UI context menu or toolbar
    • About window now contains the version number and the BCV directory
    • Adds an option to toggle to outdated status

    2 details in Everything

25. b1.5 Nov 2, 2014 · release notes

    Adds a search function to the Class Viewer in bytecode-viewer b1.5

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch b1.5 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout b1.5

    └──▷ HOW TO FIND IT
    Use the new search capability within the Class Viewer interface to locate specific classes or strings efficiently.
    📍In the Class Viewer pane, use the newly added Search function to filter and find relevant entries.
26. b1.3.1 Nov 1, 2014 · release notes

    b1.3.1 adds a decompiler option to append brackets to labels

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch b1.3.1 https://github.com/Konloch/bytecode-viewer.git
    # already have the repo? check out this version:
    $ git checkout b1.3.1

    └──▷ HOW TO FIND IT
    Configure the decompiler output style when inspecting bytecode in the GUIGUIA graphical user interface, controls such as windows, buttons and menus. It lets people use software visually rather than entering commands..
    📍Steps: Open the Decompiler settings in the GUI and enable the 'append brackets to labels' option.