8dt.net

What It Is

8DT is a free online tool for merging and splitting text files, positioned as privacy-first. Users hand text files to the browser via drag-and-drop or a file picker. The page clearly states that files move from the local file system into browser memory and are then downloaded back to the user’s machine. The server only provides the HTML, CSS, and JavaScript interface, and does not participate in processing file contents.

Core Features and Use Cases

Its merging options are fairly granular: Glue inserts blank lines between files; Merge performs a seamless merge with no extra spacing and automatically handles Unicode BOM; Mend inserts clear horizontal separators; Files adds structured context for each file, including the filename, forty hyphens, triple quotes, and similar markers. This makes it useful for consolidating multiple source files, documents, or reference materials into a single text file for large language models, code review, or document audits.

For splitting, Split divides text evenly into a specified number of parts; Divide splits by a specified byte size, with an emphasis on respecting character boundaries; Cut splits by a user-defined delimiter. The split results are packaged into a ZIP file with sequential numbering and date-stamped filenames, making them easy to use directly.

Pricing and Ease of Use

The page explicitly describes it as a free tool, with no mention of paid plans, subscriptions, or usage limits. Interaction is handled through drag-and-drop or file selection in the browser, so the barrier to entry is very low. There is no need to install local software or upload files to a backend service.

Pros and Cons

Its strengths are clear privacy logic, focused functionality, and a rich set of merge formatting options. The Files mode is especially practical for developers and AI workflows. The limitations are that the page does not state whether it is open source or self-hostable, and provides no information about an API, SDK, CLI, or automation integrations. Performance with large files, browser compatibility, error handling, and support channels are also not disclosed.

Who It’s For and Access from China

It is suitable for developers, researchers, legal and document professionals, and content creators who need to process source code, configuration files, research data, long-form drafts, or LLM context materials. Access from mainland China cannot be determined from the page alone, and there is no payment-related information. If access is unstable, local command-line tools such as cat, split, and csplit, or batch-processing features in an IDE or text editor, may be alternatives.