diff --git a/src/ui/components/Results.tsx b/src/ui/components/Results.tsx
index 43b9d34..7f150fa 100644
--- a/src/ui/components/Results.tsx
+++ b/src/ui/components/Results.tsx
@@ -8,6 +8,7 @@ import { Rule } from "./Rule";
 import { useConcurrentSearch } from "../hooks/useConcurrentSearch";
 import { getSource, SOURCES } from "../../sources/registry";
 import { wrapStep, windowStart } from "../move";
+import { sortResults, nextSort, sortLabel, sortArrow, type Sort, type SortField } from "../sort";
 import { COLOR, GUTTER, ICON, SOURCE_STYLE } from "../theme";
 import { cleanText, formatBytes, formatRelative, truncate } from "../../util/format";
 import type { Source, TorrentResult } from "../../sources/types";
@@ -123,11 +124,14 @@ export function Results() {
 
   const search = useConcurrentSearch(query);
 
+  const [sort, setSort] = useState<Sort>("none");
   const results = useMemo(() => {
     const cat = CATEGORIES.find((c) => c.key === section);
-    if (!cat?.group) return search.results;
-    return search.results.filter((r) => getSource(r.source).group === cat.group);
-  }, [search.results, section]);
+    const base = cat?.group
+      ? search.results.filter((r) => getSource(r.source).group === cat.group)
+      : search.results;
+    return sortResults(base, sort);
+  }, [search.results, section, sort]);
 
   const focused = region === "content";
   const [mode, setMode] = useState<Mode>("list");
@@ -194,6 +198,8 @@ export function Results() {
       } else if (input === "y") {
         const r = results[clamped];
         if (r) copyResultMagnet(r);
+      } else if (input === "s") {
+        setSort((cur) => nextSort(cur));
       }
     },
     { isActive: focused && mode === "list" },
@@ -282,7 +288,18 @@ export function Results() {
     const head = browsing
       ? "newest across all sources"
       : `${results.length} result${results.length === 1 ? "" : "s"}`;
-    return <Text dimColor>{head + note}</Text>;
+    const sortNote = sort === "none" ? "" : `  ${ICON.dot} sort: ${sortLabel(sort)}`;
+    return <Text dimColor>{`${head}${note}${sortNote}`}</Text>;
+  };
+
+  const sortMark = (field: SortField, label: string): ReactNode => {
+    if (sort === "none" || sort.field !== field) return label;
+    return (
+      <>
+        <Text color={COLOR.accent} bold>{sortArrow(sort.dir)}</Text>
+        {label}
+      </>
+    );
   };
 
   const start = windowStart(clamped, results.length, listHeight);
@@ -326,10 +343,10 @@ export function Results() {
                     {showStats ? (
                       <>
                         <Box width={10} flexShrink={0} marginLeft={1} justifyContent="flex-end">
-                          <Text bold dimColor>Size</Text>
+                          <Text bold dimColor>{sortMark("size", "Size")}</Text>
                         </Box>
                         <Box width={9} flexShrink={0} marginLeft={1} justifyContent="flex-end">
-                          <Text bold dimColor>Seed:Lch</Text>
+                          <Text bold dimColor>{sortMark("seeders", "Seed:Lch")}</Text>
                         </Box>
                       </>
                     ) : (
@@ -338,7 +355,7 @@ export function Results() {
                       </Box>
                     )}
                     <Box width={4} flexShrink={0} marginLeft={1} justifyContent="flex-end">
-                      <Text bold dimColor>Src</Text>
+                      <Text bold dimColor>{sortMark("source", "Src")}</Text>
                     </Box>
                   </Box>
                 ) : null}
diff --git a/src/ui/hooks/useConcurrentSearch.ts b/src/ui/hooks/useConcurrentSearch.ts
index 9f61fa5..061fc25 100644
--- a/src/ui/hooks/useConcurrentSearch.ts
+++ b/src/ui/hooks/useConcurrentSearch.ts
@@ -42,13 +42,6 @@ function dedupe(list: TorrentResult[]): TorrentResult[] {
   return [...byHash.values()];
 }
 
-function sortResults(list: TorrentResult[]): TorrentResult[] {
-  return list.sort((a, b) => {
-    if (b.seeders !== a.seeders) return b.seeders - a.seeders;
-    return (b.added ?? 0) - (a.added ?? 0);
-  });
-}
-
 function idleState(): ConcurrentSearchState {
   return {
     results: [],
@@ -105,7 +98,7 @@ export function useConcurrentSearch(query: string): ConcurrentSearchState {
           if (!alive) return;
           done += 1;
           setState({
-            results: sortResults(dedupe(collected.slice())),
+            results: dedupe(collected.slice()),
             perSource: { ...per },
             loading: done < SOURCES.length,
             done,
diff --git a/src/ui/keymap.ts b/src/ui/keymap.ts
index a42ac0a..436ce11 100644
--- a/src/ui/keymap.ts
+++ b/src/ui/keymap.ts
@@ -27,6 +27,7 @@ export const HELP_GROUPS: HelpGroup[] = [
     hints: [
       { keys: "/", label: "Edit search" },
       { keys: "↵", label: "Run search" },
+      { keys: "s", label: "Sort results" },
       { keys: "y", label: "Copy magnet" },
       { keys: "m", label: "Paste magnet" },
     ],
@@ -101,6 +102,7 @@ export function footerHints(
   return [
     NAVIGATE,
     { keys: "d", label: "Download" },
+    { keys: "s", label: "Sort" },
     { keys: "y", label: "Copy magnet" },
     { keys: "/", label: "Search" },
     { keys: "m", label: "Paste magnet" },
diff --git a/src/ui/sort.test.ts b/src/ui/sort.test.ts
new file mode 100644
index 0000000..d577b73
--- /dev/null
+++ b/src/ui/sort.test.ts
@@ -0,0 +1,125 @@
+import { describe, it, expect } from "vitest";
+import { nextSort, sortResults, sortArrow, SORT_CYCLE } from "./sort";
+import type { Sort } from "./sort";
+import type { SourceId, TorrentResult } from "../sources/types";
+
+function r(p: Partial<TorrentResult> & { infoHash: string }): TorrentResult {
+  return {
+    name: p.name ?? p.infoHash,
+    sizeBytes: p.sizeBytes ?? 0,
+    seeders: p.seeders ?? 0,
+    leechers: p.leechers ?? 0,
+    source: (p.source ?? "yts") as SourceId,
+    magnet: p.magnet ?? `magnet:?xt=urn:btih:${p.infoHash}`,
+    ...p,
+  };
+}
+
+const ids = (list: TorrentResult[]): string[] => list.map((x) => x.infoHash);
+
+describe("nextSort", () => {
+  it("cycles through 7 states: none -> size asc/desc -> seeders asc/desc -> source asc/desc -> none", () => {
+    const seq: Sort[] = [];
+    let s: Sort = "none";
+    for (let i = 0; i < 7; i++) {
+      s = nextSort(s);
+      seq.push(s);
+    }
+    expect(seq).toEqual([
+      { field: "size", dir: "asc" },
+      { field: "size", dir: "desc" },
+      { field: "seeders", dir: "asc" },
+      { field: "seeders", dir: "desc" },
+      { field: "source", dir: "asc" },
+      { field: "source", dir: "desc" },
+      "none",
+    ]);
+  });
+
+  it("SORT_CYCLE has exactly 7 states starting with none", () => {
+    expect(SORT_CYCLE).toHaveLength(7);
+    expect(SORT_CYCLE[0]).toBe("none");
+  });
+});
+
+describe("sortArrow", () => {
+  it("points up for asc and down for desc", () => {
+    expect(sortArrow("asc")).toBe("▴");
+    expect(sortArrow("desc")).toBe("▾");
+  });
+});
+
+describe("sortResults", () => {
+  it("none preserves the original arrival order", () => {
+    const list = [
+      r({ infoHash: "a", sizeBytes: 1, seeders: 1 }),
+      r({ infoHash: "b", sizeBytes: 9, seeders: 9 }),
+      r({ infoHash: "c", sizeBytes: 5, seeders: 5 }),
+    ];
+    expect(ids(sortResults(list, "none"))).toEqual(["a", "b", "c"]);
+  });
+
+  it("size asc: smallest first", () => {
+    const list = [
+      r({ infoHash: "a", sizeBytes: 500 }),
+      r({ infoHash: "b", sizeBytes: 100 }),
+      r({ infoHash: "c", sizeBytes: 900 }),
+    ];
+    expect(ids(sortResults(list, { field: "size", dir: "asc" }))).toEqual(["b", "a", "c"]);
+  });
+
+  it("size desc: largest first", () => {
+    const list = [
+      r({ infoHash: "a", sizeBytes: 500 }),
+      r({ infoHash: "b", sizeBytes: 100 }),
+      r({ infoHash: "c", sizeBytes: 900 }),
+    ];
+    expect(ids(sortResults(list, { field: "size", dir: "desc" }))).toEqual(["c", "a", "b"]);
+  });
+
+  it("seeders asc: fewest first", () => {
+    const list = [
+      r({ infoHash: "a", seeders: 50 }),
+      r({ infoHash: "b", seeders: 5 }),
+      r({ infoHash: "c", seeders: 90 }),
+    ];
+    expect(ids(sortResults(list, { field: "seeders", dir: "asc" }))).toEqual(["b", "a", "c"]);
+  });
+
+  it("seeders desc: most first", () => {
+    const list = [
+      r({ infoHash: "a", seeders: 50 }),
+      r({ infoHash: "b", seeders: 5 }),
+      r({ infoHash: "c", seeders: 90 }),
+    ];
+    expect(ids(sortResults(list, { field: "seeders", dir: "desc" }))).toEqual(["c", "a", "b"]);
+  });
+
+  it("source asc: A->Z by source id", () => {
+    const list = [
+      r({ infoHash: "a", source: "yts" }),
+      r({ infoHash: "b", source: "eztv" }),
+      r({ infoHash: "c", source: "nyaa" }),
+    ];
+    expect(ids(sortResults(list, { field: "source", dir: "asc" }))).toEqual(["b", "c", "a"]);
+  });
+
+  it("source desc: Z->A by source id", () => {
+    const list = [
+      r({ infoHash: "a", source: "eztv" }),
+      r({ infoHash: "b", source: "yts" }),
+      r({ infoHash: "c", source: "nyaa" }),
+    ];
+    expect(ids(sortResults(list, { field: "source", dir: "desc" }))).toEqual(["b", "c", "a"]);
+  });
+
+  it("does not mutate the input array", () => {
+    const list = [
+      r({ infoHash: "a", sizeBytes: 1 }),
+      r({ infoHash: "b", sizeBytes: 2 }),
+    ];
+    const before = ids(list);
+    sortResults(list, { field: "size", dir: "asc" });
+    expect(ids(list)).toEqual(before);
+  });
+});
diff --git a/src/ui/sort.ts b/src/ui/sort.ts
new file mode 100644
index 0000000..0443e85
--- /dev/null
+++ b/src/ui/sort.ts
@@ -0,0 +1,62 @@
+import type { TorrentResult } from "../sources/types";
+
+export type SortField = "size" | "seeders" | "source";
+export type SortDir = "asc" | "desc";
+export interface SortState {
+  field: SortField;
+  dir: SortDir;
+}
+
+/** A sort selection, or "none" for the untouched/default order. */
+export type Sort = SortState | "none";
+
+/**
+ * The order the `s` key cycles through: start untouched, then each field
+ * ascending then descending, then back to untouched.
+ */
+export const SORT_CYCLE: Sort[] = [
+  "none",
+  { field: "size", dir: "asc" },
+  { field: "size", dir: "desc" },
+  { field: "seeders", dir: "asc" },
+  { field: "seeders", dir: "desc" },
+  { field: "source", dir: "asc" },
+  { field: "source", dir: "desc" },
+];
+
+function sameSort(a: Sort, b: Sort): boolean {
+  if (a === "none" || b === "none") return a === b;
+  return a.field === b.field && a.dir === b.dir;
+}
+
+export function nextSort(current: Sort): Sort {
+  const i = SORT_CYCLE.findIndex((s) => sameSort(s, current));
+  return SORT_CYCLE[(i + 1) % SORT_CYCLE.length]!;
+}
+
+export function sortArrow(dir: SortDir): string {
+  return dir === "asc" ? "▴" : "▾";
+}
+
+export function sortLabel(sort: Sort): string {
+  if (sort === "none") return "default";
+  return `${sort.field} ${sortArrow(sort.dir)}`;
+}
+
+export function sortResults(list: TorrentResult[], sort: Sort): TorrentResult[] {
+  const arr = list.slice();
+  if (sort === "none") return arr;
+  const mul = sort.dir === "asc" ? 1 : -1;
+  switch (sort.field) {
+    case "size":
+      arr.sort((a, b) => mul * (a.sizeBytes - b.sizeBytes) || b.seeders - a.seeders);
+      break;
+    case "seeders":
+      arr.sort((a, b) => mul * (a.seeders - b.seeders) || (b.added ?? 0) - (a.added ?? 0));
+      break;
+    case "source":
+      arr.sort((a, b) => mul * a.source.localeCompare(b.source) || b.seeders - a.seeders);
+      break;
+  }
+  return arr;
+}