Free & open-source Chrome extension

Your XML is 2 GB?
We parse it in 3 seconds.

Stream-parse massive XML files directly in your browser. Search millions of elements by tag, attribute, or value. No frozen tabs. No RAM explosions. No drama.

Add to Chrome — Free See how it works ↓
2 GB
Maximum file size
~20 MB
RAM usage (any file size)
500+ MB/s
Parsing throughput
5
Interface languages
Features

Everything you need to tame massive XML

Built for files that other tools refuse to open. Streaming architecture means constant memory, responsive UI, and results in seconds.

🚀

Stream parsing up to 2 GB

Reads your file in 8–16 MB chunks using File.slice(). No DOM tree is built — SAX events fire as data flows. Your browser stays responsive throughout.

🔍

Search across millions of elements

Filter by tag name, attribute name, attribute value, or text content. Combine any filters. Results stream in real-time as the file is parsed — no need to wait for completion.

📖

Code preview with syntax highlighting

Click any element to see its full XML with children, beautifully formatted and color-coded. Navigate through up to 50 samples per tag with ◀ ▶ controls.

🗂️

Document structure at a glance

All elements displayed by nesting depth with occurrence counts. See the full hierarchy of your XML document without scrolling through millions of lines.

💡

Built-in XML anatomy guide

New to XML? An interactive color-coded breakdown is generated from your actual file data. Hover over any part to learn what's a tag, attribute, or value.

🌍

5 languages, zero tracking

Interface in English, Russian, German, Spanish, and French. Auto-detected from browser. All processing is local — your files never leave your machine.

How it works

From 2 GB file to answers in 4 steps

No upload. No server. Everything happens in your browser.

Drop your XML

Drag a file into the extension or click to browse. Any size up to 2 GB.

Set filters (optional)

Enter a tag name, attribute, value, or text to search for. Or just parse everything.

Hit Parse

A Web Worker reads chunks via File.slice(), feeds them to a SAX parser. Progress bar shows speed in MB/s.

Explore results

Statistics, element hierarchy, search matches, and code previews — all ready in seconds.

Comparison

Why XML Stream Parser?

Other tools load the entire file into memory. We don't.

Feature Notepad / Text Editor DOM-based XML Viewer XML Stream Parser
Max file size ~50 MB ~200 MB 2 GB
RAM for 500 MB file 500 MB+ 2–5 GB (DOM tree) ~20 MB
UI stays responsive Freezes Freezes Always
Search by attribute value Ctrl+F only Sometimes Tag + Attr + Value + Text
Element code preview No Partial Full with highlighting
Data sent to server No Sometimes Never
// what happened to the competition
<!-- filed under: rip.in.peace -->
<Competitors xmlns="rip.in.peace" Rating="A for effort">
  <Competitor Name="Notepad"         Status="Died trying"                      LastWords="OutOfMemoryException"/>
  <Competitor Name="Browser Tab"     Status="Ran out of RAM and left the chat"/>
  <Competitor Name="Excel"           MaxRows="65536"                            Status="Showed 65536 rows and gave up"/>
  <Competitor Name="OnlineXMLViewer" Privacy="lol"                             UploadedYourData="true"/>
</Competitors>
FAQ

Frequently asked questions

How to open a large XML file in Chrome? +
Install XML Stream Parser from the Chrome Web Store, click the extension icon, and drag your XML file into it. It handles files up to 2 GB using streaming SAX parsing, so your browser won't freeze or crash. The file is processed in small chunks — only ~20 MB of RAM is used regardless of file size.
Can I search inside a 2 GB XML file? +
Yes. You can search by tag name, attribute name, attribute value, or text content — or combine all four. Results appear in real-time as the file is being parsed. For a 1.8 GB file, a search across 2.4 million elements typically completes in under 4 seconds.
How much RAM does it use? +
About 20 MB regardless of file size. Unlike DOM-based parsers that load the entire file into memory (often 3–10x the file size), XML Stream Parser reads the file in small chunks and discards each chunk after processing. A 2 GB file uses the same RAM as a 2 KB file.
Is my XML data safe? +
Absolutely. All processing happens locally in your browser using a Web Worker. Your XML files are never uploaded to any server — not ours, not anyone's. The extension only requires the "storage" permission to save your language preference. No analytics, no tracking, no data collection.
What XML formats are supported? +
Any valid XML including SOAP, OTA, RSS, Atom, SVG, XSLT, XSD, KML, GPX, plist, and custom schemas. The parser handles namespaces, CDATA sections, comments, processing instructions, and all standard XML entities. It does not validate against DTD or Schema — it parses the structure.
What languages does the interface support? +
English, Russian (Русский), German (Deutsch), Spanish (Español), and French (Français). The language is auto-detected from your browser settings and can be switched at any time from the dropdown in the header.
Why not just use DOMParser or other XML viewers? +
DOMParser loads the entire file into an in-memory tree that's 3–10x larger than the file itself. A 500 MB XML file can consume 4+ GB of RAM and freeze your browser. Other XML viewer extensions are built on the same principle and can't handle files beyond ~200 MB. XML Stream Parser uses SAX (Simple API for XML) in a dedicated Web Worker — it processes the file as a stream without building a tree, using constant memory.
// terms & conditions (the honest version)
<Legal>
  <License Type="MIT">Do whatever you want. Life is short.</License>
  <Privacy>
    <DataCollected>None</DataCollected>
    <DataSold>LOL no</DataSold>
    <Cookies>Only the chocolate chip kind</Cookies>
  </Privacy>
  <Warranty>THE SOFTWARE IS PROVIDED "AS IS" AND ALSO "AS AWESOME"</Warranty>
</Legal>

<Credits>
  <BuiltWith Love="true" Coffee="∞" SleepDeprivation="moderate"/>
  <SpecialThanks To="You" Reason="For reading this far in an XML file"/>
</Credits>

Your 2 GB XML won't parse itself.

Free. Local. Fast. No excuses left.

Add to Chrome — Free