A link extractor API alternative that runs entirely in the browser parses pasted HTML, resolves relative paths against an optional HTTP or HTTPS base URL, and returns one deduplicated target per line without sending your source, your base URL, or the discovered destinations to a third-party endpoint. The shift from an endpoint-based service to an in-page parser removes per-call pricing, removes the API key and account workflow, removes rate-limit queues, and removes the quiet privacy question of what the remote service does with the URLs you submit. Because the work happens locally on the HTML you already have access to, the tool fits routine SEO audits, content migrations, structural reviews, and security spot-checks where you already possess the markup and only need a clean inventory. The trade-off is equally clear: a local source parser cannot reach out and resolve a short link for you, evaluate HTTP status, follow redirects, render JavaScript, or label which targets are internal versus external, so those jobs still belong to a controlled crawler you authorize yourself.
Reasons Teams Step Away From a Link Extractor API
Endpoint-based link extraction services charge per call, gate usage behind accounts, and quietly pass both your input HTML and the URLs inside it across the network. At small volumes the friction is invisible; at audit scale, where hundreds of pages are reviewed per migration, dozens of templates are checked per release, or dozens of pasted snippets arrive in a ticket thread each week, the per-call meter, the request log, and the queue time become operational headaches. Teams also discover that the precise shape of fields a link extractor API returns (raw text, decoded entities, normalized scheme, base URL interpretation) varies by vendor, so swapping endpoints mid-project means re-mapping columns in the audit spreadsheet.
A local alternative sidesteps each of those concerns because the parser runs against HTML you have already retrieved through a method you control. The page source you copied from your browser's View Source dialog, the HTML your crawler stored, or the markup your CMS exported never leaves the page. There is no API key to rotate, no monthly invoice, no silent rate-limit throttling the audit when the team is racing a launch deadline. The trade, and it is the only one worth naming up front, is that the parser cannot invent data it has not been given: it works from the source you already hold.
How an In-Browser Alternative Differs in Practice
An in-page link extractor accepts pasted HTML and an optional base URL, then displays the deduplicated result alongside counts of unique, duplicate, and skipped entries. The visible behavior shifts compared to an API workflow in three concrete ways:
- Input shape. You provide a block of HTML rather than a target URL for the service to fetch. The tool never asks a remote server for the document itself.
- Base URL handling. When you fill in an absolute HTTP or HTTPS page address, root-relative, path-relative, parent-relative, and scheme-relative values resolve against it. When you leave the field blank, those values stay relative so the output never invents a host.
- Output format. You receive one URL per line in first-seen order, with transparent counters showing what was filtered, instead of a paginated JSON envelope tied to a per-call SKU.
The Link Extractor follows that contract: parse start tags for href attributes, normalize web, mail, and telephone links, drop duplicates after normalization, and skip executable schemes while reporting how many targets were omitted along the way.
Extracting Links from Pasted HTML
The workflow below uses the Link Extractor and assumes you have HTML you are authorized to inspect, whether copied from a View Source dialog, downloaded from your own crawler, or exported from a CMS export you control.
- Paste the authorized HTML source into the input area. If the markup contains values like /pricing or ../guide, also enter the absolute page URL on which that source would render into the base URL field.
- Run the extraction. The tool scans start tags, normalizes href values, resolves anything relative against the supplied base, and discards executable schemes.
- Review the counters. The unique, duplicate, and skipped counts reveal how the input was reduced; an apparently short list is rarely a missing-link bug if the skipped count explains it.
- Copy the one-per-line result into your audit sheet, migration backlog, or crawler seed list, and keep the original source file beside it for later comparison.
- Separately verify status codes, redirect chains, the meaning of rel attributes, and any dynamically inserted links using a crawler you control, since static-source parsing is an inventory rather than a health report.
If your pasted HTML came from a DevTools copy that includes both rendered markup and fragments inside script blocks, the parser strips common raw-text containers such as script, style, iframe, and title before scanning, so anchor-shaped strings inside JavaScript do not become false links. That is the same reason paste-from-View-Source typically produces a cleaner audit result than paste-from-DevTools for static-source reviews.
What the Local Parser Filters and Why
Filtering is the part most teams underestimate until they read the skipped counter. The parser removes a defined set of href values that are unsafe, invalid, or unhelpful for a link inventory, and it shows the totals so nothing is hidden.
| Category | Examples | Reason for filtering |
|---|---|---|
| Executable schemes | javascript:, data:, vbscript: | Following them inside a crawler can trigger scripts or render embedded payloads. |
| Empty and self references | href="", href="#section" | These are navigation hints inside the same document, not crawl targets. |
| Invalid absolute URLs | Malformed scheme or authority | Listed targets that cannot resolve waste crawler budget and confuse downstream tools. |
| Credential-bearing bases | https://user:pass@host/ | The base URL must be credential-free so user details are not echoed into every resolved result. |
Mail and telephone targets are deliberately retained because they are legitimate destinations for a link inventory; a contact link in the footer still belongs in the link graph. Numeric character references and a small set of named entities are decoded so typical query escaping reads cleanly in the output, and duplicates are removed only after normalization, so two identical relative paths that resolve to the same absolute URL collapse into one entry while preserving first-seen order. Deduplication is exact after normalization; it does not claim that URLs differing by tracking parameters, fragments, case-sensitive paths, or redirect behavior identify the same resource. Input is capped at 200,000 characters to keep the interactive scan bounded, so very large documents should be split or pre-filtered before parsing.
Where a Source Parser Stops Being Enough
Knowing the limits keeps the result honest. A link extractor API alternative that runs locally cannot:
- Fetch any of the extracted URLs to check status, redirect chains, or canonical declarations.
- Render JavaScript, so links inserted by single-page applications after mount never appear in static source.
- Label a target as internal versus external, interpret rel attributes such as nofollow or sponsored, or decide whether a listed target is canonical, preload, or stylesheet.
- Cope with severely malformed markup any better than a bounded scan can, since unquoted attributes and missing raw-text closing tags can shift what the parser sees compared to a real browser DOM.
For those checks, hand the deduplicated list to an authorized crawler or compare the extraction against a DevTools DOM export. Treat the parsed list as inventory, then verify. A simple sequence for an audit looks like this: paste source, supply the base URL, run the parser, copy the one-per-line result, then hand the list to a controlled crawler, and for an end-to-end walkthrough of that exact workflow see the guide on extracting every URL from page source for SEO audits. Static source parsing returns inventory; a real crawler turns inventory into evidence.
API Workflow vs Local Parser at a Glance
The table below compares the two workflows on the dimensions most teams weigh when deciding to leave endpoint-based extraction behind.
| Dimension | Link extractor API | Local source parser |
|---|---|---|
| Input supplied to the service | Often the target URL, sometimes HTML | Pasted HTML you already possess |
| Account and API key required | Yes, with rotation and quota tracking | No |
| Per-call cost | Billed per request or per URL fetched | None |
| Network calls to listed destinations | Often makes HEAD or GET requests | Never, since destination URLs are not contacted |
| Data leaving the browser | HTML plus every URL inside it, plus your credentials | None |
| Rate limits and queues | Enforced by the service tier | Limited only by your machine |
| Relative URL resolution | Depends on the endpoint's contract | Optional HTTP or HTTPS base URL, credential-free |
| Output shape | JSON or paginated envelope tied to a SKU | One deduplicated URL per line with transparent counts |
| Dynamic DOM links | Sometimes, depending on the backend | No, since only static source markup is parsed |
| Status, redirect, and rel checks | Often bundled into the same call | Out of scope, so the result pairs with an authorized crawler |
The rows where a local parser wins, including privacy, cost, and queue-free scale, are the same rows that motivate the move away from an endpoint. The rows where an API traditionally wins, namely fetching the page and reading the response, are also where the move introduces an explicit handoff: paste your own HTML, then verify with a tool you run yourself.
For a deeper look, see Bulk QR Code Generator on Mac: A Local Browser Workflow.