Local browser generation. Nothing is uploaded.

Generate Sample Test Files in Your Browser

Create lightweight dummy files up to 10MB for upload forms, parsers, API tests, demos, and QA workflows. Supported formats: TXT, CSV, JSON, XML, HTML, LOG, BIN, SVG, Markdown, YAML, TOML.

Instant download

Generate one file and download it immediately.

No server storage

Files are created in your browser and never touch our backend.

Simple formats only

Browser-safe text, data, SVG, and binary test files.

FormatPlain text sample with repeated safe content.

Size

Filename preview

sample-100kb.txt

Target size: 100 KB

Local browser generation

Generated locally in your browser. Nothing is uploaded, stored, or sent to TrueFileSize.

Preview

Sample TXT file generated locally by TrueFileSize.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeholder text for upload, parser, and QA testing.
This is safe placeh

What can you generate locally?

Format	Best for	Why it is safe in FE
TXT, LOG, Markdown	Text upload and parser tests	Plain text Blob
CSV, JSON, XML	Data import and API fixtures	Controlled templates
HTML, SVG	Markup parser and preview tests	No user script execution
BIN	Raw byte and upload size tests	Uint8Array bytes only
YAML, TOML	Config parser tests	Plain text templates

Frequently Asked Questions

Are generated files uploaded to TrueFileSize?

No. Files are generated locally in your browser with native Web APIs. Nothing is uploaded, stored, or sent to TrueFileSize.

Which formats can be generated locally?

This tool supports lightweight formats that browsers can create safely: TXT, CSV, JSON, XML, HTML, LOG, BIN, SVG, Markdown, YAML, and TOML.

Why not PDF, MP4, DOCX, XLSX, or ZIP?

Those formats need heavier encoders or libraries, increase client bundle size, and are easier to generate incorrectly. TrueFileSize keeps those as prebuilt sample files served from the CDN.

What is the maximum file size?

The maximum generated file size is 10MB per action. Larger test files should use the existing CDN-hosted Download Tests collection.

Need large CDN-hosted files instead?

Browser generation is intentionally capped at 10MB. For 100MB, 1GB, and 10GB files, use the prebuilt files served from the TrueFileSize CDN.

Open Download Tests