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Automated code migration

Upgrade your
legacy code
automatically.

Paste your code, select source and target versions, hit Convert. Deprecated APIs, renamed classes and changed syntax are rewritten instantly — with annotated migration notes.

→ Start migrating How it works
// converters

Pick your language

Select a converter, choose source and target versions, and paste your code.

↗ Python

Python Converter

Modernise Python 2 code to Python 3, or upgrade older Python 3 code to take advantage of the latest language features.

2 → 3 3.5 → 3.10 3.8 → 3.12
↗ PHP

PHP Converter

Migrate legacy PHP 5 code with deprecated mysql_* functions and ereg to modern PHP 8 syntax in one step.

5.6 → 7.4 7.x → 8.2 5.6 → 8.2
↗ Bootstrap

Bootstrap Converter

Rename deprecated CSS classes, update data attributes for jQuery-free BS5, and modernise component markup automatically.

3 → 4 4 → 5 3 → 5
// workflow

Four steps to
modern code

01

Select language

Choose Python, PHP or Bootstrap from the navigation.

02

Choose versions

Pick source version (what you have) and target version (what you want).

03

Paste your code

Drop your legacy code into the left editor. The right panel shows the converted output live.

04

Review & copy

Check the migration notes, diff highlights and changed line count. Copy with one click.

// supported migrations

Every upgrade path covered

Python
Handles print statements, unicode types, urllib reorganisation, typing module modernisation, and async/await patterns.
Python 2 → Python 3 (full rewrite)
Python 3.5 → Python 3.10
Python 3.8 → Python 3.12
PHP
Replaces mysql_*, ereg and mcrypt with modern equivalents. Adds null coalescing, match expressions and nullsafe operators.
PHP 5.6 → PHP 7.4
PHP 7.x → PHP 8.2
PHP 5.6 → PHP 8.2 (full jump)
Bootstrap
Renames utility classes, updates data-* attributes to data-bs-*, replaces removed components with modern equivalents.
Bootstrap 3 → Bootstrap 4
Bootstrap 4 → Bootstrap 5
Bootstrap 3 → Bootstrap 5 (full jump)
// faq

Common questions

How accurate is the automated conversion?
Code Updater handles the vast majority of systematic, pattern-based changes: renamed functions, removed APIs, changed syntax rules, and class renames. Complex logic that requires semantic understanding — like full database migration from mysql_* to PDO with prepared statements — is flagged with comments so you know what still needs manual work. Migration notes explain every category of change.
Can I migrate PHP 5.6 directly to PHP 8.2?
Yes. The PHP 5.6 → 8.2 path applies all breaking changes across multiple major versions in a single pass: removing mysql_*, replacing ereg with preg_*, removing mcrypt, and adding modern PHP 8 patterns like null coalescing, match expressions, str_contains, and nullsafe operators.
Does the Python 2 to 3 converter handle everything?
It handles print statements, unicode/basestring/long/xrange types, exception syntax, dictionary methods (iteritems/itervalues/iterkeys), urllib module reorganisation, StringIO/Queue/ConfigParser renames, and apply/execfile/reload replacements. For very large codebases, consider running 2to3 alongside as a verification step.
What Bootstrap 5 changes are most critical?
The two most impactful changes are: (1) jQuery is no longer required — all JavaScript initialisation moves to vanilla Bootstrap 5 API; (2) all data-* attributes renamed to data-bs-* (data-toggle→data-bs-toggle, data-dismiss→data-bs-dismiss). Directional utilities also changed: left/right renamed to start/end to support RTL.
Is my code sent to a server?
No. All conversion logic runs entirely in your browser using JavaScript. Your code never leaves your device. This makes Code Updater safe to use with proprietary, commercial or confidential codebases.