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.chls
Code & DataMedium Risk
78/100 Popularity

.CHLS File Extension Reference

The .CHLS file represents structured program code or hierarchical data serialization formatted in standard UTF-8 or ASCII character encodings. Files with the .CHLS extension are categorized under Code & Data and are widely utilized in modern computing environments for storing, rendering, and exchanging structured data. By verifying the header signature (EF BB BF 7B) using forensic byte inspection tools, users can authenticate file integrity and rule out disguised executable payloads.

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Quick Specification & Metadata

.CHLS
File Extension

.CHLS

Category

Code & Data

MIME Type

application/x-charles-savedsession

Developer / Owner

XK72 / Charles Web Debugging Proxy

First Released

N/A

Licensing Standard

Proprietary / Patent Licensed

Format Structure

Binary Header Data

Typical File Size

10 KB - 5 MB

Common Usage:chls file, chls file extension, open chls file

Online .CHLS Viewer & Live Inspector

Open, inspect, zoom, and export .CHLS files directly in your web browser. 100% private in-memory processing.

Client-Side Memory

Drop your .CHLS file here or browse

Inspect and preview any .CHLS file securely with zero server uploads.

Instant Browser Render•No Software Installation Required•Zero Data Uploaded

What is a .CHLS File? (Technical Definition & Architecture)

ISO / IETF / Industry Standard

The .CHLS file represents structured program code or hierarchical data serialization formatted in standard UTF-8 or ASCII character encodings. Files with the .CHLS extension are categorized under Code & Data and are widely utilized in modern computing environments for storing, rendering, and exchanging structured data. By verifying the header signature (EF BB BF 7B) using forensic byte inspection tools, users can authenticate file integrity and rule out disguised executable payloads.

Binary Encoding
Structured Data Stream

Formatted byte alignment adhering to international format specifications.

Validation Standard
Specification Conformance

Adheres to formal schema and protocol documentation.

Cross-Platform Portability
Cross-Platform Interoperability

Parsed and executed identically across Windows, macOS, and Linux kernels.

CHLS Binary Structure & Header Specifications

The .CHLS format organizes data into validated sequential or hierarchical byte structures. Inspecting the header offset reveals the magic byte sequence EF BB BF 7B.

  • File Signature (Magic Bytes): EF BB BF 7B
  • MIME Content-Type: application/x-charles-savedsession
  • Payload Structure: Optimized data stream with metadata headers and checksum records.
  • Safety Classification: Medium Risk – Open CHLS files in Charles Web Debugging Proxy; the format is a proprietary saved-session file rather than a generic ZIP or text log Treat captured sessions as confidential because they may contain URLs, request bodies, cookies, authorization headers, tokens, and personal data Redact credentials and sensitive payloads before sharing a session or exporting it to XML, CSV, or trace text Do not rename .chls to .har or .json; use Charles export tools to create a standard exchange format Files ending in .CHLS should always be inspected for valid magic bytes to verify they match legitimate Code & Data specifications.

How to Open .CHLS Files on Windows, Mac & Android

Step-by-Step OS Guide
How to Open on Windows 10/11
  1. 1Primary Application: Double-click or open directly with Charles Web Debugging Proxy.
  2. 2Alternative Software: Open using Charles command-line tools.
  3. 3File Association: Right-click the file, select Open with > Choose another app, and check Always use this app.
How to Open on Mac & iPhone
  1. 1Native macOS Application: Open with Charles Web Debugging Proxy.
  2. 2Quick Look Preview: Highlight the file in Finder and tap the Spacebar.
  3. 3Set Default App: Press Cmd + I, expand Open with, select your application, and click Change All.
How to Open on Android & Mobile
  1. 1Compatible Mobile Apps: Download a dedicated viewer for .chls from the Google Play Store.
  2. 2Cloud Storage: Open through Google Drive, Dropbox, or OneDrive mobile apps.
  3. 3Online Browser Conversion: Use AnyFileX mobile browser tools to convert the file into universal PDF or image formats.

Convert .CHLS Files Online & Free

Zero Server Uploads
.CHLS to .PDFTop ConversionFast Online

Convert your .CHLS files directly into standardized .PDF format with high precision and zero privacy compromises.

.CHLS to .JPGUniversal ExportStandard Output

Export .CHLS files to .JPG for universal cross-platform viewing, printing, and sharing.

.CHLS MIME Types & HTTP Server Headers

IANA Standard

When serving .chls files over HTTP or configuring REST APIs, web servers must send the official IANA registered Content-Type headers:

MIME Type IdentifierStandard UsageFile ExtensionsCopy
application/x-charles-savedsessionStandard official MIME type for .chls files.chls
Nginx / Apache Server Configuration
# Nginx mime.types
types {
    application/x-charles-savedsession     chls;
}

# Apache .htaccess
AddType application/x-charles-savedsession .chls

.CHLS Magic Bytes & Hex File Signatures

Offset 0x00

In digital forensics and file signature analysis, authentic .chls files begin with a standardized magic byte sequence at byte offset 0x00 to verify file integrity and prevent extension spoofing:

Standard Hex Header Signature
Hex Representation:EF BB BF 7B
ASCII Representation:CHLS
Byte OffsetOffset 0x00
Leading Hex SignatureEF BB BF 7B
ASCII RepresentationCHLS
Forensic DomainCode & Data File Format

.CHLS vs .PDF (Detailed Format Comparison)

Head-to-Head
Feature Metric.CHLS.PDFAdvantage
Format Full NameCHLS File FormatPortable Document FormatTie / Equal
CategoryCode & DataDocumentsTie / Equal
MIME Content-Typeapplication/x-charles-savedsessionapplication/pdfTie / Equal
Binary Header (Magic Bytes)EF BB BF 7B25 50 44 46 2D (%PDF-)Tie / Equal
Typical Storage Footprint10 KB - 5 MB200 KB – 25 MBTie / Equal
Universal Native SupportHigh / OS StandardHigh / OS StandardTie / Equal

.CHLS Compatibility Matrix

Windows 11 / 10

Supported natively or through Charles Web Debugging Proxy

Full Support
macOS Sonoma / Ventura

Supported natively or via Charles command-line tools

Supported
Linux (Ubuntu / Fedora)

Supported via open-source tools and command line utilities

Supported
iOS & iPadOS

Accessible through compatible mobile viewers or cloud previewers

Mobile App
Android 10+

Supported through dedicated mobile apps or cloud viewers

Mobile App
ChromeOS

Accessible via web browser applications and Chrome extensions

Web / App

Recommended Software for .CHLS

4 Verified Apps
C

Charles Web Debugging Proxy

XK72 / Charles Web Debugging Proxy

Paid / Commercial
4.7 / 5.0
•
Compatible with .CHLS
C

Charles command-line tools

XK72 / Charles Web Debugging Proxy

Paid / Commercial
4.8 / 5.0
•
Compatible with .CHLS
V

Visual Studio Code for exported text

Microsoft Corporation

Free
4.9 / 5.0
•
windows, mac, linux
Compatible with .CHLS
A

AnyFileX File Identifier

XK72 / Charles Web Debugging Proxy

Paid / Commercial
4.7 / 5.0
•
Compatible with .CHLS

Common Errors & Troubleshooting .CHLS Files

Troubleshooting
1Inspect File Header: Use the AnyFileX Magic Byte Detector to verify that the first bytes match EF BB BF 7B.
2Prevent Extension Spoofing: Ensure "File name extensions" is checked in your OS file manager to detect disguised double extensions (e.g., file.CHLS.exe).
3Verify Checksum Integrity: Calculate SHA-256 or MD5 hashes against source downloads using our online Checksum Verifier.
4Inspect Container Structure: If CHLS files fail to launch, verify whether the file was truncated during download or corrupted in transit.

Security & Malware Risk Assessment

Medium Risk

Can a .CHLS file carry viruses or malware?

Open CHLS files in Charles Web Debugging Proxy; the format is a proprietary saved-session file rather than a generic ZIP or text log Treat captured sessions as confidential because they may contain URLs, request bodies, cookies, authorization headers, tokens, and personal data Redact credentials and sensitive payloads before sharing a session or exporting it to XML, CSV, or trace text Do not rename .chls to .har or .json; use Charles export tools to create a standard exchange format Files ending in .CHLS should always be inspected for valid magic bytes to verify they match legitimate Code & Data specifications.

Executable Macros

May support scripting or automation macros

Sandboxed Parsing

Safe to inspect with AnyFileX's browser sandbox

Safety Checklist Before Opening
  • •Verify file extension in OS File Explorer options ('Show known file extensions').
  • •Verify magic bytes (EF BB BF 7B) to ensure the file isn't a renamed executable.
  • •Do not open .CHLS attachments received unexpectedly via email or instant messenger.

Frequently Asked Questions

A .CHLS file is a CHLS File Format associated with Code & Data. A .CHLS file is a Charles Web Debugging Proxy session containing recorded HTTP and HTTPS traffic for later analysis. Learn how to open CHLS files in Charles, export request data to XML, CSV, or trace text, and protect sensitive captured credentials.
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    A .CHLS file is a CHLS File Format file format categorized under Code & Data. A .CHLS file is a Charles Web Debugging Proxy session containing recorded HTTP and HTTPS traffic for later analysis. Learn how to open CHLS files in Charles, export request data to XML, CSV, or trace text, and protect sensitive captured credentials.

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