Browser-first online tools
Convert images, audio and video, extract archives, edit subtitles, format data and generate IDs or SEO tags. Free browser tools. No signup.
Featured tools
Browse by format
282+ browser tools
Choose a category to see its formats, focused tools and available workflows.
Convert, compress, resize and optimize images.
Convert · Compress · Resize · Crop70 toolsConvert and edit audio in your browser when supported.
Convert · Cut · Mix · Record45 toolsCreate, inspect and extract common archives.
Convert · Extract · Create archives29 toolsCount, clean and format data, or generate developer identifiers.
JSON · CSV · UUID · ULID38 toolsCreate UUID, GUID and sortable developer identifiers.
UUID · UUID v7 · ULID · GUID · NIL5 toolsGenerate and check essential search metadata.
Metadata · Sitemaps · Indexing8 toolsConvert, edit and combine subtitle files.
Convert · Edit · Merge subtitles33 toolsConvert, edit and prepare videos locally in your browser.
Convert · Create GIF · Extract audio · Record59 toolsCombine several tools in one guided, repeatable process.
Convert · Resize · Compress8 workflowsSave the busywork
Run common file tasks in one repeatable flow.
Private by default
zer.ai uses browser technology to process supported files on your device. Your files do not need to wait in an upload queue, and no account is needed for core tools.
Common questions
Supported tools process files in your browser. Each tool page clearly states its processing method.
The core tools are free to use without an account.
We target current versions of Chrome, Edge, Firefox and Safari. Format support can vary.
Limits depend on browser memory and the selected tool. Each page shows its current limit.
Learn more
Use zer.ai to convert and compress images, edit audio and video, extract archives, work with subtitles, format text and data, and generate developer IDs or SEO tags. Core tools are free to use in your browser without creating an account.
Open a specific tool when you already know the task, such as converting HEIC to JPG, changing WAV to MP3, formatting JSON or extracting a ZIP file.
Use the Online Audio Mixer to layer voice and music, the Internal Audio Recorder to capture permitted browser-tab audio without saving video, or PNG to ICO to make multi-size icons. Developers can generate UUIDs and ULIDs. For simpler tasks, try the Character Counter or MP3 Converter. Choose a workflow when several steps belong together, such as converting, resizing and compressing a batch of images.
Image tools help you change formats, resize photos, compress images and prepare files for websites or online services. Audio tools cover common format changes, trimming, merging and compression. Text, data and SEO tools are useful for formatting JSON, converting CSV or XML, checking word counts and preparing search metadata.
Subtitle and archive tools complete the common file workflow. Convert SRT or VTT captions, adjust subtitle timing, extract ZIP or 7Z files and create supported archives without moving between several unrelated websites.
The video tools cover supported format conversions, editing, GIF creation and audio extraction. Format compatibility and file-size limits depend on the tool and your browser.
Supported tools process files locally in your browser. File compatibility and size limits vary by format and device, so each tool page explains its processing method and limitations. Keep an original copy of important files before processing.
Explore image, audio, video, archive, text and data, SEO and subtitle tools, or browse the developer generators. Related tools and reverse conversion links help you move between tasks without losing the file task you started.
zer.ai is designed for one-off file tasks as well as repeatable workflows. Open the page that matches your need, process a supported input, check the result and download it. Browser support, file limits and format-specific behavior are explained on each tool page so you can choose the right option before processing an important file.
